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【学习资料】袋中共36个球,红白黑格12个,问能一次抽到3个红4个白5个黑的概率是多少?

1、公式计算

1.1 题目1

袋中共 36 36 36个球, 红 \fcolorbox{red}{#FADADE}{\color{red}{红}} 白 \fcolorbox{white}{#808080}{\color{white}{白}} 黑 \fcolorbox{#808080}{#0D0D0D}{\color{#808080}{黑}} 12 12 12个,问能一次抽到 3个红 \fcolorbox{red}{#FADADE}{\color{red}{3个红}} 3个红 4个白 \fcolorbox{white}{#808080}{\color{white}{4个白}} 4个白 5个黑 \fcolorbox{#808080}{#0D0D0D}{\color{#808080}{5个黑}} 5个黑的概率是多少?

P m r , m w , m b = C n r m r × C n w m w × C n b m b C n m P_{m_r,m_w,m_b} = \frac{C_{n_r}^{m_r} \times C_{n_w}^{m_w} \times C_{n_b}^{m_b} }{C_{n}^{m}} Pmr,mw,mb=CnmCnrmr×Cnwmw×Cnbmb
其中:
P m r , m w , m b P_{m_r,m_w,m_b} Pmr,mw,mb – 概率
C n m C_{n}^{m} Cnm – n个球中,抽m个球的组合数。
C n r m r C_{n_r}^{m_r} Cnrmr n r n_r nr个红球中,抽 m r m_r mr个红球的组合数。
C n w m w C_{n_w}^{m_w} Cnwmw n w n_w nw个白球中,抽 m r m_r mr个白球的组合数。
C n b m b C_{n_b}^{m_b} Cnbmb n b n_b nb个黑球中,抽 m b m_b mb个黑球的组合数。

根据已知条件代入公式:
已知条件 { n r = 12 n w = 12 n b = 12 m r = 3 m w = 4 m b = 5 n = 36 m = 12 已知条件 \begin{cases} n_r=12 \\ n_w=12 \\ n_b=12 \\ m_r=3 \\ m_w=4 \\ m_b=5 \\ n=36 \\ m=12 \\ \end{cases} 已知条件 nr=12nw=12nb=12mr=3mw=4mb=5n=36m=12

P 3 r , 4 w , 5 b = C 12 3 × C 12 4 × C 12 5 C 36 12 = 12 ! 3 ! × ( 12 − 3 ) ! × 12 ! 4 ! × ( 12 − 4 ) ! × 12 ! 5 ! × ( 12 − 5 ) ! 36 ! 12 ! × ( 36 − 12 ) ! = 12 ! 3 ! × 9 ! × 12 ! 4 ! × 8 ! × 12 ! 5 ! × 7 ! 36 ! 12 ! × 24 ! = 12 ! 3 ! × ( 12 − 3 ) ! × 12 ! 4 ! × ( 12 − 4 ) ! × 12 ! 5 ! × ( 12 − 5 ) ! 36 ! 12 ! × ( 36 − 12 ) ! = 479 , 001 , 600 6 × 362 , 880 × 479 , 001 , 600 24 × 40 , 320 × 479 , 001 , 600 120 × 5 , 040 371 , 993 , 326 , 789 , 901 , 217 , 467 , 999 , 448 , 150 , 835 , 200 , 000 , 000 479 , 001 , 600 × 620 , 448 , 401 , 733 , 239 , 439 , 360 , 000 = 220 × 495 × 792 1 , 251 , 677 , 700 = 86 , 248 , 800 1 , 251 , 677 , 700 = 95832 1390753 = 0.06890655637629399325401419231165 \begin{equation} \begin{split} P_{3_r,4_w,5_b} &= \frac{C_{12}^{3} \times C_{12}^{4} \times C_{12}^{5} }{C_{36}^{12}} \\ &=\frac{\frac{12!}{3!\times (12-3)!}\times \frac{12!}{4!\times (12-4)!} \times\frac{12!}{5!\times (12-5)!}}{\frac{36!}{12!\times (36-12)!}} \\ &=\frac{\frac{12!}{3!\times 9!}\times \frac{12!}{4!\times 8!} \times\frac{12!}{5!\times 7!}}{\frac{36!}{12!\times 24!}} \\ &=\frac{\frac{12!}{3!\times (12-3)!}\times \frac{12!}{4!\times (12-4)!} \times\frac{12!}{5!\times (12-5)!}}{\frac{36!}{12!\times (36-12)!}} \\ &=\frac{\frac{479,001,600}{6\times 362,880}\times \frac{479,001,600}{24\times 40,320} \times\frac{479,001,600}{120\times 5,040}}{\frac{371,993,326,789,901,217,467,999,448,150,835,200,000,000}{479,001,600\times 620,448,401,733,239,439,360,000}} \\ &=\frac{ 220 \times 495 \times 792}{1,251,677,700} \\ &=\frac{86,248,800}{1,251,677,700} \\ &=\frac{95832}{1390753} \\ &=0.06890655637629399325401419231165 \end{split} \end{equation} P3r,4w,5b=C3612C123×C124×C125=12!×(3612)!36!3!×(123)!12!×4!×(124)!12!×5!×(125)!12!=12!×24!36!3!×9!12!×4!×8!12!×5!×7!12!=12!×(3612)!36!3!×(123)!12!×4!×(124)!12!×5!×(125)!12!=479,001,600×620,448,401,733,239,439,360,000371,993,326,789,901,217,467,999,448,150,835,200,000,0006×362,880479,001,600×24×40,320479,001,600×120×5,040479,001,600=1,251,677,700220×495×792=1,251,677,70086,248,800=139075395832=0.06890655637629399325401419231165

1.2 题目2

袋中共 36 36 36 个球, 红 \fcolorbox{red}{#FADADE}{\color{red}{红}} 白 \fcolorbox{white}{#808080}{\color{white}{白}} 黑 \fcolorbox{#808080}{#0D0D0D}{\color{#808080}{黑}} 12 12 12个,问能一次抽到颜色组合是 3 3 3 4 4 4 5 5 5 的概率是多少?

P m 1 , m 2 , m 3 = N ! N 1 ! × N 2 ! × … × N k ! × C n 1 m 1 × C n 2 m 2 × C n 3 m 3 C n m P_{m_1,m_2,m_3} =\frac{N!}{N_1! \times N_2! \times \ldots \times N_k!} \times \frac{C_{n_1}^{m_1} \times C_{n_2}^{m_2} \times C_{n_3}^{m_3} }{C_{n}^{m}} Pm1,m2,m3=N1!×N2!××Nk!N!×CnmCn1m1×Cn2m2×Cn3m3
其中:
P m 1 , m 2 , m 3 P_{m_1,m_2,m_3} Pm1,m2,m3 – 概率
C n m C_{n}^{m} Cnm – n个球中,抽m个球的组合数。
C n 1 m 1 C_{n_1}^{m_1} Cn1m1 n 1 n_1 n1个颜色1球中,抽 m 1 m_1 m1个颜色1球的组合数。
C n 2 m 2 C_{n_2}^{m_2} Cn2m2 n 2 n_2 n2个颜色2球中,抽 m 2 m_2 m2个颜色2球的组合数。
C n 3 m 3 C_{n_3}^{m_3} Cn3m3 n 3 n_3 n3个颜色3球中,抽 m 3 m_3 m3个颜色3球的组合数。
N ! N 1 ! × N 2 ! × … × N k ! \frac{N!}{N_1! \times N_2! \times \ldots \times N_k!} N1!×N2!××Nk!N! m 1 、 m 2 、 m 3 m_1、m_2、m_3 m1m2m3数的排列组合数。

m 1 、 m 2 、 m 3 m_1、m_2、m_3 m1m2m3 N ! N 1 ! × N 2 ! × … × N k ! \frac{N!}{N_1! \times N_2! \times \ldots \times N_k!} N1!×N2!××Nk!N!排列组合
3,4,5第1个数3出现1次
第2个数4出现1次
第3个数5出现1次
3 ! 1 ! × 1 ! × 1 ! \frac{3!}{1! \times 1!\times 1!} 1!×1!×1!3!
3,4,5
3,5,4
4,3,5
4,5,3
5,4,3
5,3,4
4,4,4第1个数4出现3次
3 ! 3 ! \frac{3!}{3!} 3!3!
4,4,4
3,3,6第1个数3出现2次
第2个数6出现1次
3 ! 2 ! × 1 ! \frac{3!}{2! \times 1!} 2!×1!3!
3,3,6
3,6,3
6,3,3
1,1,10第1个数1出现2次
第2个数10出现1次
3 ! 2 ! × 1 ! \frac{3!}{2! \times 1!} 2!×1!3!
1,1,10
1,10,1
10,1,1
… \ldots … \ldots … \ldots

根据已知条件代入公式:
已知条件 { n 1 = 12 n 2 = 12 n 3 = 12 m 1 = 3 m 2 = 4 m 3 = 5 n = 36 m = 12 N = 3 N 1 ( 3 ) = 1 N 2 ( 4 ) = 1 N 3 ( 5 ) = 1 已知条件 \begin{cases} n_1=12 \\ n_2=12 \\ n_3=12 \\ m_1=3 \\ m_2=4 \\ m_3=5 \\ n=36 \\ m=12 \\ N=3\\ N_{1(3)}=1\\ N_{2(4)}=1\\ N_{3(5)}=1\\ \end{cases} 已知条件 n1=12n2=12n3=12m1=3m2=4m3=5n=36m=12N=3N1(3)=1N2(4)=1N3(5)=1

P 3 , 4 , 5 = 3 ! 1 ! × 1 ! × 1 ! × C 12 3 × C 12 4 × C 12 5 C 36 12 = 6 1 × 12 ! 3 ! × ( 12 − 3 ) ! × 12 ! 4 ! × ( 12 − 4 ) ! × 12 ! 5 ! × ( 12 − 5 ) ! 36 ! 12 ! × ( 36 − 12 ) ! = 6 × 12 ! 3 ! × 9 ! × 12 ! 4 ! × 8 ! × 12 ! 5 ! × 7 ! 36 ! 12 ! × 24 ! = 6 × 12 ! 3 ! × ( 12 − 3 ) ! × 12 ! 4 ! × ( 12 − 4 ) ! × 12 ! 5 ! × ( 12 − 5 ) ! 36 ! 12 ! × ( 36 − 12 ) ! = 6 × 479 , 001 , 600 6 × 362 , 880 × 479 , 001 , 600 24 × 40 , 320 × 479 , 001 , 600 120 × 5 , 040 371 , 993 , 326 , 789 , 901 , 217 , 467 , 999 , 448 , 150 , 835 , 200 , 000 , 000 479 , 001 , 600 × 620 , 448 , 401 , 733 , 239 , 439 , 360 , 000 = 6 × 220 × 495 × 792 1 , 251 , 677 , 700 = 6 × 86 , 248 , 800 1 , 251 , 677 , 700 = 6 × 95832 1390753 = 574992 1390753 = 0.41343933825776395952408515386988 \begin{equation} \begin{split} P_{3,4,5} &=\frac{3!}{1! \times 1!\times 1!}\times \frac{C_{12}^{3} \times C_{12}^{4} \times C_{12}^{5} }{C_{36}^{12}} \\ &=\frac{6}{1}\times\frac{\frac{12!}{3!\times (12-3)!}\times \frac{12!}{4!\times (12-4)!} \times\frac{12!}{5!\times (12-5)!}}{\frac{36!}{12!\times (36-12)!}} \\ &=6\times \frac{\frac{12!}{3!\times 9!}\times \frac{12!}{4!\times 8!} \times\frac{12!}{5!\times 7!}}{\frac{36!}{12!\times 24!}} \\ &=6\times \frac{\frac{12!}{3!\times (12-3)!}\times \frac{12!}{4!\times (12-4)!} \times\frac{12!}{5!\times (12-5)!}}{\frac{36!}{12!\times (36-12)!}} \\ &=6\times \frac{\frac{479,001,600}{6\times 362,880}\times \frac{479,001,600}{24\times 40,320} \times\frac{479,001,600}{120\times 5,040}}{\frac{371,993,326,789,901,217,467,999,448,150,835,200,000,000}{479,001,600\times 620,448,401,733,239,439,360,000}} \\ &=6\times \frac{ 220 \times 495 \times 792}{1,251,677,700} \\ &=6\times \frac{86,248,800}{1,251,677,700} \\ &=6\times \frac{95832}{1390753} \\ &=\frac{ 574992}{1390753} \\ &=0.41343933825776395952408515386988 \end{split} \end{equation} P3,4,5=1!×1!×1!3!×C3612C123×C124×C125=16×12!×(3612)!36!3!×(123)!12!×4!×(124)!12!×5!×(125)!12!=6×12!×24!36!3!×9!12!×4!×8!12!×5!×7!12!=6×12!×(3612)!36!3!×(123)!12!×4!×(124)!12!×5!×(125)!12!=6×479,001,600×620,448,401,733,239,439,360,000371,993,326,789,901,217,467,999,448,150,835,200,000,0006×362,880479,001,600×24×40,320479,001,600×120×5,040479,001,600=6×1,251,677,700220×495×792=6×1,251,677,70086,248,800=6×139075395832=1390753574992=0.41343933825776395952408515386988

2、枚举法

使用程序模拟每一次抽取,计算每一步的概率,并进行累计汇总。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Threading.Tasks;
using static GL39_9.Program;

namespace GL39_9
{
    internal class Program
    {
        /// <summary>
        /// 汇总类型
        /// </summary>
        public enum eSummaryType
        {
            /// <summary>
            /// 按数量汇总
            /// </summary>
            Number,
            /// <summary>
            /// 按名称和数量汇总
            /// P(36,12(3,4,5))=N! * C(12,3)*C(12,4)*C(12,5)/C(36,12)
            /// C(12,3) = 12!/(3!*(12-3)!) = 12!/(3!*9!)
            /// C(12,4) = 12!/(4!*(12-4)!) = 12!/(4!*8!)
            /// C(12,4) = 12!/(5!*(12-5)!) = 12!/(5!*7!)
            /// 3 4 5 (N=3)
            /// 4 4 4 (N=1)
            /// 3 3 6 (N=2)
            /// </summary>
            NameNumber
        }

        public static double Calc(int[] keys,int pre=12)
        {

            int nType = keys.GroupBy(o=>o).Count();
            BigInteger FT = Factorial(nType);
            int t = pre * keys.Count();
            int c = keys.Sum(o=>o);
            BigInteger fz = 1;
            foreach (var item in keys)
            {
                fz *= C(pre, item);
            }
            BigInteger fm = C(t,c);
            return ((double)(long)FT * ((double)(long)fz / (double)(long)fm));
        }
        public static BigInteger C(int n,int m)
        {
            var fn = Factorial(n);
            var fm = Factorial(m);
            var fmn = Factorial(n-m);
            return fn /(fm * fmn);
        }
        public static BigInteger Factorial(int n)
        {
            if (n < 0) throw new ArgumentException("n must be non-negative.");
            if (n == 0) return 1;
            return n * Factorial(n - 1);
        }
        /// <summary>
        /// 暗盒/袋中的物品信息
        /// </summary>
        public class CBlackBoxItem
        {
            /// <summary>
            /// 物品唯一编号
            /// </summary>
            public int Id { get; set; }
            /// <summary>
            /// 物品名称
            /// </summary>
            public string Name { get; set; }
            /// <summary>
            /// 物品数量
            /// </summary>
            public int Number { get; set; }
            /// <summary>
            /// 
            /// </summary>
            /// <param name="id">物品唯一编号</param>
            /// <param name="name">物品名称</param>
            /// <param name="number">物品数量</param>
            public CBlackBoxItem(int id, string name, int number)
            {
                Id = id;
                Name = name;
                Number = number;
            }
            /// <summary>
            /// 物品信息
            /// </summary>
            /// <returns></returns>
            public override string ToString()
            {
                return $"{Id}.{Name} {Number}个";
            }
            /// <summary>
            /// 复制物品信息及数量
            /// </summary>
            /// <returns></returns>
            public CBlackBoxItem Copy()
            {
                return new CBlackBoxItem(Id, Name, Number);
            }
            /// <summary>
            /// 复制物品并减去指定数量的物品
            /// </summary>
            /// <param name="val"></param>
            /// <returns></returns>
            public CBlackBoxItem CopySub(int val)
            {
                return new CBlackBoxItem(Id, Name, Number - val);
            }
            /// <summary>
            /// 复制物品并设置数量
            /// </summary>
            /// <param name="val"></param>
            /// <returns></returns>
            public CBlackBoxItem Copy(int val)
            {
                return new CBlackBoxItem(Id, Name, val);
            }
        }
        /// <summary>
        /// 轮次信息
        /// </summary>
        public class CRoundInformation
        {
            /// <summary>
            /// 前一轮的信息
            /// </summary>
            public CRoundInformation previousRound = null;
            /// <summary>
            /// 本轮暗箱信息
            /// </summary>
            public List<CBlackBoxItem> CurrentRoundBlackBox = new List<CBlackBoxItem> {
                new CBlackBoxItem(1,"红色球/棍子",9),
                new CBlackBoxItem(2,"绿色球/棍子",9),
                new CBlackBoxItem(3,"蓝色球/棍子",9),
            };

            /// <summary>
            /// 从暗盒中获取总数量
            /// </summary>
            /// <returns></returns>
            public int GetTotalNumberFromBlackBox()
            {
                return CurrentRoundBlackBox.Select(o => o.Number).Sum();
            }
            /// <summary>
            /// 当前从暗箱中抽中的物品
            /// </summary>
            public CBlackBoxItem CurrentDrawnBlackBoxItem = null;
            /// <summary>
            /// 当前轮次概率
            /// </summary>
            public double CurrentRoundProbability = 0;
            /// <summary>
            /// 累计所有轮的概率
            /// </summary>
            public double CumulativeProbability = 0;
            /// <summary>
            /// 累计所有抽到的物品
            /// </summary>
            public List<CBlackBoxItem> CumulativeDrawnBlackBoxItems = new List<CBlackBoxItem>();
            /// <summary>
            /// 所有抽到的物品归类信息
            /// </summary>
            public string SummaryInformation = "";
            /// <summary>
            /// 轮次
            /// </summary>
            public int RoundIndex = 0;
            /// <summary>
            /// 更新累计的概率
            /// </summary>
            public void UpdateCumulativeProbability()
            {
                double probability = 1.0;
                GetCumulativeProbability(this, ref probability);
                CumulativeProbability = probability;
            }
            /// <summary>
            /// 递归获取累计概率
            /// </summary>
            /// <param name="roundInformation"></param>
            /// <param name="probability"></param>
            private void GetCumulativeProbability(CRoundInformation roundInformation, ref double probability)
            {
                if (roundInformation == null) return;
                if (roundInformation.RoundIndex <= 0) return;
                probability *= roundInformation.CurrentRoundProbability;
                GetCumulativeProbability(roundInformation.previousRound, ref probability);
            }
           
            /// <summary>
            /// 统计抽到的物品,获取汇总信息
            /// </summary>
            public void UpdateDrawnBlackBoxItems(eSummaryType summaryType = eSummaryType.Number)
            {
                List<CBlackBoxItem> blackBoxItems = new List<CBlackBoxItem>();
                GetDrawnBlackBoxItems(this, ref blackBoxItems);

                CumulativeDrawnBlackBoxItems = blackBoxItems;
                List<CBlackBoxItem> temps = new List<CBlackBoxItem>();
                foreach (var item in CurrentRoundBlackBox)
                {
                    temps.Add(item.Copy(blackBoxItems.Where(o => o.Id == item.Id).Count()));
                }
                temps = temps.OrderByDescending(o => o.Number).ToList();
                if(summaryType == eSummaryType.Number)
                {
                    SummaryInformation = string.Join(":", temps.Select(o => o.Number));
                }
                else if (summaryType == eSummaryType.NameNumber)
                {
                    SummaryInformation = string.Join(":", temps.Select(o => o.Number)) +"|" + string.Join(":", temps);
                }
            }
            /// <summary>
            /// 递归获取每一轮的物品
            /// </summary>
            /// <param name="roundInformation"></param>
            /// <param name="blackBoxItems"></param>
            private void GetDrawnBlackBoxItems(CRoundInformation roundInformation, ref List<CBlackBoxItem> blackBoxItems)
            {
                if (roundInformation == null) return;
                if (roundInformation.RoundIndex <= 0) return;
                blackBoxItems.Add(roundInformation.CurrentDrawnBlackBoxItem);
                GetDrawnBlackBoxItems(roundInformation.previousRound, ref blackBoxItems);
            }
            /// <summary>
            /// 从暗盒中抽一个物品
            /// </summary>
            /// <param name="roundIndex"></param>
            /// <returns></returns>
            public List<CRoundInformation> DrawnOneItemFromBlackBox(int roundIndex)
            {
                List<CRoundInformation> roundInformations = new List<CRoundInformation>();
                var total = GetTotalNumberFromBlackBox();
                foreach (var item in CurrentRoundBlackBox)
                {
                    if (item.Number <= 0)
                    {
                        continue;
                    }
                    CRoundInformation roundInformation = new CRoundInformation();
                    roundInformation.RoundIndex = roundIndex;
                    roundInformation.previousRound = this;
                    roundInformation.CurrentDrawnBlackBoxItem = new CBlackBoxItem(item.Id, item.Name, 1);
                    roundInformation.CurrentRoundProbability = item.Number / (double)total;
                    roundInformation.CurrentRoundBlackBox.Clear();
                    foreach (var itme in CurrentRoundBlackBox)
                    {
                        if (item.Id == itme.Id)
                        {
                            roundInformation.CurrentRoundBlackBox.Add(itme.CopySub(1));
                        }
                        else
                        {
                            roundInformation.CurrentRoundBlackBox.Add(itme.Copy());
                        }
                    }
                    roundInformations.Add(roundInformation);
                }
                return roundInformations;
            }
        }

        /// <summary>
        /// 概率小游戏
        /// </summary>
        public class CProbabilityGame
        {
            public List<CRoundInformation> Source = new List<CRoundInformation>();
            public int DrawnTimes = 9;
            /// <summary>
            /// 每次抽取花费
            /// 100块抽5次
            /// </summary>
            public double SpendEveryTime = 20;
            public eSummaryType SummaryType =   eSummaryType.Number;

            /// <summary>
            /// 奖池
            /// </summary>
            public Dictionary<string, double> Jackpots = new Dictionary<string, double>
            {
                {"9:0:0",100},//:  0.000640092173272951‰
                {"8:1:0",30},//:  0.103694932070218‰
                {"7:2:0",10},//:  1.65911891312349‰
                {"7:1:1",20},//:  1.86650877726393‰
                {"6:3:0",10},//:  9.03298074922795‰
                {"6:2:1",10},//:  34.8414971755928‰
                {"5:4:0",2},//:  20.3242066857629‰
                {"5:3:1",2},//:  121.945240114572‰
                {"5:2:2",1},//:  104.524491526778‰
                {"4:4:1",1},//:  91.4589300859336‰
                {"4:3:2",-10},//:  487.780960458368‰
                {"3:3:3",1}//:  126.461730489187‰
            };
            public CProbabilityGame()
            {
                //Init312Drawn12();
                Init39Drawn9();
            }
            /// <summary>
            /// 3 种颜色的物品 每种 12个,抽12个
            /// </summary>
            public void Init312Drawn12()
            {
                DrawnTimes = 12;
                SummaryType = eSummaryType.Number;
                var item = new CRoundInformation();
                item.CurrentRoundBlackBox.Clear();
                item.CurrentRoundBlackBox = new List<CBlackBoxItem> {
                new CBlackBoxItem(1,"红色球/棍子",DrawnTimes),
                new CBlackBoxItem(2,"绿色球/棍子",DrawnTimes),
                new CBlackBoxItem(3,"蓝色球/棍子",DrawnTimes),
                };
                Source.Add(item);
                Jackpots.Clear();
                Jackpots = new Dictionary<string, double>
            {
                {"12:0:0",100},//2.39678313354948E-06‰
                {"11:1:0",30},//0.00069027354246225‰
                {"10:2:0",20},//0.020880774659483‰
                {"10:1:1",20},//0.0227790269012542‰
                {"9:3:0",10},//0.232008607327592‰
                {"9:2:1",10},//0.835230986379351‰
                {"8:4:0",5},//1.17454357459599‰
                {"8:3:1",5},//6.26423239784602‰
                {"8:2:2",5},//5.16799172822235‰
                {"7:5:0",5},//3.0068315509653‰
                {"7:4:1",2},//22.551236632241‰
                {"7:3:2",2},//55.1252451009996‰
                {"6:6:0",5},//2.04631591662927‰
                {"6:5:1",2},//42.0956417134937‰
                {"6:4:2",1},//144.70376839016‰
                {"6:3:3",1},//107.187976585368‰
                {"5:5:2",1},//99.2254411818329‰
                {"5:4:3",-10},//413.439338257532‰
                {"4:4:4",1},//96.8998449041164‰
            };
            }
            /// <summary>
            /// 3 种颜色的物品 每种 9个,抽9个
            /// </summary>
            public void Init39Drawn9()
            {
                DrawnTimes = 9;
                SpendEveryTime = 0.5;
                SummaryType = eSummaryType.Number;
                var item = new CRoundInformation();
                item.CurrentRoundBlackBox.Clear();
                item.CurrentRoundBlackBox = new List<CBlackBoxItem> {
                new CBlackBoxItem(1,"红色球/棍子",DrawnTimes),
                new CBlackBoxItem(2,"绿色球/棍子",DrawnTimes),
                new CBlackBoxItem(3,"蓝色球/棍子",DrawnTimes),
                };
                Source.Add(item);
                Jackpots.Clear();
                Jackpots = new Dictionary<string, double>
            {
                {"9:0:0",100},//:  0.000640092173272951‰
                {"8:1:0",30},//:  0.103694932070218‰
                {"7:2:0",10},//:  1.65911891312349‰
                {"7:1:1",20},//:  1.86650877726393‰
                {"6:3:0",10},//:  9.03298074922795‰
                {"6:2:1",10},//:  34.8414971755928‰
                {"5:4:0",2},//:  20.3242066857629‰
                {"5:3:1",2},//:  121.945240114572‰
                {"5:2:2",1},//:  104.524491526778‰
                {"4:4:1",1},//:  91.4589300859336‰
                {"4:3:2",-10},//:  487.780960458368‰
                {"3:3:3",1}//:  126.461730489187‰
            };
            }
            /// <summary>
            /// 计算
            /// </summary>
            /// <returns></returns>
            public double Calculate()
            {
                List<CRoundInformation> listTemp = new List<CRoundInformation>();
                Drawn(ref listTemp);
                Cumulative(ref listTemp);
                var pro = SummaryProbabilitys(listTemp);
                if(CheckProbabilitys(pro))
                {
                    return CalculateProfitLoss(pro);

                }
                return double.MinValue;
            }
            /// <summary>
            /// 检查概率是否归一
            /// </summary>
            /// <param name="Probabilitys"></param>
            /// <returns></returns>
            public bool CheckProbabilitys(Dictionary<string, double> Probabilitys)
            {
                var val = Probabilitys.Sum(o => o.Value);
                System.Diagnostics.Debug.WriteLine(val);
                if(val>1-0.0000001 && val<1+0.0000001)
                {
                    return true;
                }
                return false;
            }
            /// <summary>
            /// 累计
            /// </summary>
            /// <param name="listTemp"></param>
            private void Cumulative(ref List<CRoundInformation> listTemp)
            {
                foreach (var item in listTemp)
                {
                    item.UpdateCumulativeProbability();
                    item.UpdateDrawnBlackBoxItems(SummaryType);
                }
            }
            /// <summary>
            /// 抽取
            /// </summary>
            /// <param name="listTemp"></param>
            private void Drawn(ref List<CRoundInformation> listTemp)
            {
                listTemp = Source;
                for (int i = 1; i <= DrawnTimes; i++)
                {
                    var temps = new List<CRoundInformation>();
                    foreach (var item in listTemp)
                    {
                        if (item.RoundIndex < i - 1)
                        {
                            continue;
                        }
                        var list = item.DrawnOneItemFromBlackBox(i);
                        temps.AddRange(list);
                    }
                    listTemp = temps;
                }
            }
            /// <summary>
            /// 汇总
            /// </summary>
            /// <param name="listTemp"></param>
            /// <returns></returns>
            private Dictionary<string, double> SummaryProbabilitys(List<CRoundInformation> listTemp)
            {
                Dictionary<string, double> Probabilitys = new Dictionary<string, double>();
                System.Diagnostics.Debug.WriteLine($"|组合|概率");
                System.Diagnostics.Debug.WriteLine($"|--|--|");

                foreach (var item in listTemp.GroupBy(o => o.SummaryInformation).OrderByDescending(o => o.Key))
                {
                    var glall = item.Sum(o => o.CumulativeProbability);
                    Probabilitys.Add(item.Key, glall);
                    System.Diagnostics.Debug.WriteLine($"|{item.Key}|{glall * 100}%");
                    //System.Diagnostics.Debug.WriteLine($"{{\"{item.Key}\",{1.0/ glall}}},//{glall*1000}‰");
                }
                return Probabilitys;
            }

            /// <summary>
            /// 计算盈亏
            /// </summary>
            private double CalculateProfitLoss(Dictionary<string, double> Probabilitys)
            {
                double revenue = -SpendEveryTime;
                foreach (var item in Jackpots)
                {
                    if (Probabilitys.ContainsKey(item.Key))
                    {
                        revenue += Probabilitys[item.Key] * item.Value;
                    }
                }
                return revenue;
            }
            static void Main(string[] args)
            {
                CProbabilityGame game = new CProbabilityGame();
                var item = Program.Calc(new int[3] {3,4,5 },12);
                System.Diagnostics.Debug.WriteLine(item);
                var val = 20 * game.Calculate();
                System.Diagnostics.Debug.WriteLine(val);
            }
            
            
        }
    }
}

3、拓展

街头玩法

在这里插入图片描述
每次费用 10 / 20 = 0.5 元 10/20=0.5元 10/20=0.5
根据概率,抽一次罚 3.7749845577769543 元 3.7749845577769543元 3.7749845577769543
加上成本 0.5 0.5 0.5 ,每把亏 4.2749845577769543 元 4.2749845577769543元 4.2749845577769543
每次交费玩 20 20 20次,一次缴费 4.2749845577769543 × 20 = 85.499691155539086 元 4.2749845577769543\times 20=85.499691155539086元 4.2749845577769543×20=85.499691155539086

常见玩法概率表

3种颜色物品,每种9个,每次抽9个的概率

组合概率
9:0:00.0000640092173272951%
8:1:00.0103694932070218%
7:2:00.165911891312349%
7:1:10.186650877726393%
6:3:00.903298074922795%
6:2:13.48414971755928%
5:4:02.03242066857629%
5:3:112.1945240114572%
5:2:210.4524491526778%
4:4:19.14589300859336%
4:3:248.7780960458368%
3:3:312.6461730489187%

3种颜色物品,每种12个,每次抽12个的概率

组合概率
12:0:00.000000239678313354948%
11:1:00.000069027354246225%
10:2:00.0020880774659483%
10:1:10.00227790269012542%
9:3:00.0232008607327592%
9:2:10.0835230986379351%
8:4:00.117454357459599%
8:3:10.626423239784602%
8:2:20.516799172822235%
7:5:00.30068315509653%
7:4:12.2551236632241%
7:3:25.51252451009996%
6:6:00.204631591662927%
6:5:14.20956417134937%
6:4:214.470376839016%
6:3:310.7187976585368%
5:5:29.92254411818329%
5:4:341.3439338257532%
4:4:49.68998449041164%

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