下表は最初に配られた5枚のカードの中にロイヤルに関連するカード(各マークの10,J,Q,K,A)が何枚あるのかを表したものです。
1組52枚のトランプを使用した全259万8960手に対して、1〜126までの126パターン存在します。(ロイヤルに関連するカードの構成を参照)
S,H,D,Cは4種類のマーク、スペード,ハート,ダイヤ,クラブを意味します。その下の4つの数字はロイヤル関連カードが各マークに何枚入っているかを表します。例えば、10番目のパターン「0
4 0 1」の場合は、5枚のカードの中にハートの10〜Aが4枚とクラブの10〜Aが1枚ある状態となります。
「2-9's」とは、ロイヤルフラッシュに関連のないカード(各マークの2〜9)を意味します。全部で32枚(52-4*8)あります。
この126パターンを18種類の構成に分けてぞれぞれの組合せを算出します。
| ROYAL関連カードの構成 |
10,J,Q,K,A |
2-9's |
組合せ |
計算過程 (便宜上、nCm を C[n,m] とします) |
| S |
H |
D |
C |
合計 |
合計 |
|
|
|
|
|
|
|
|
|
|
| 1 |
5 (S) |
5 |
0 |
0 |
0 |
5 |
0 |
4 |
|
C[4,1] * C[5,5] |
| = |
4 * 1 |
| = |
4 |
|
| 2 |
5 (H) |
0 |
5 |
0 |
0 |
5 |
0 |
| 3 |
5 (D) |
0 |
0 |
5 |
0 |
5 |
0 |
| 4 |
5 (C) |
0 |
0 |
0 |
5 |
5 |
0 |
| 5 |
4-1 (S_1) |
4 |
1 |
0 |
0 |
5 |
0 |
300 |
|
C[4,1] * C[5,4] * C[3,1] * C[5,1] |
| = |
4 * 5 * 3 * 5 |
| = |
12 * 25 |
| = |
300 |
|
| 6 |
4-1 (S_2) |
4 |
0 |
1 |
0 |
5 |
0 |
| 7 |
4-1 (S_3) |
4 |
0 |
0 |
1 |
5 |
0 |
| 8 |
4-1 (H_1) |
1 |
4 |
0 |
0 |
5 |
0 |
| 9 |
4-1 (H_2) |
0 |
4 |
1 |
0 |
5 |
0 |
| 10 |
4-1 (H_3) |
0 |
4 |
0 |
1 |
5 |
0 |
| 11 |
4-1 (D_1) |
1 |
0 |
4 |
0 |
5 |
0 |
| 12 |
4-1 (D_2) |
0 |
1 |
4 |
0 |
5 |
0 |
| 13 |
4-1 (D_3) |
0 |
0 |
4 |
1 |
5 |
0 |
| 14 |
4-1 (C_1) |
1 |
0 |
0 |
4 |
5 |
0 |
| 15 |
4-1 (C_2) |
0 |
1 |
0 |
4 |
5 |
0 |
| 16 |
4-1 (C_3) |
0 |
0 |
1 |
4 |
5 |
0 |
| 17 |
4 (S) |
4 |
0 |
0 |
0 |
4 |
1 |
640 |
|
C[4,1] * C[5,4] * C[32,1] |
| = |
4 * 5 * 32 |
| = |
4 * 160 |
| = |
640 |
|
| 18 |
4 (H) |
0 |
4 |
0 |
0 |
4 |
1 |
| 19 |
4 (D) |
0 |
0 |
4 |
0 |
4 |
1 |
| 20 |
4 (C) |
0 |
0 |
0 |
4 |
4 |
1 |
| 21 |
3-2 (S_1) |
3 |
2 |
0 |
0 |
5 |
0 |
1200 |
|
C[4,1] * C[5,3] * C[3,1] * C[5,2] |
| = |
4 * 10 * 3 * 10 |
| = |
12 * 100 |
| = |
1200 |
|
| 22 |
3-2 (S_2) |
3 |
0 |
2 |
0 |
5 |
0 |
| 23 |
3-2 (S_3) |
3 |
0 |
0 |
2 |
5 |
0 |
| 24 |
3-2 (H_1) |
2 |
3 |
0 |
0 |
5 |
0 |
| 25 |
3-2 (H_2) |
0 |
3 |
2 |
0 |
5 |
0 |
| 26 |
3-2 (H_3) |
0 |
3 |
0 |
2 |
5 |
0 |
| 27 |
3-2 (D_1) |
2 |
0 |
3 |
0 |
5 |
0 |
| 28 |
3-2 (D_2) |
0 |
2 |
3 |
0 |
5 |
0 |
| 29 |
3-2 (D_3) |
0 |
0 |
3 |
2 |
5 |
0 |
| 30 |
3-2 (C_1) |
2 |
0 |
0 |
3 |
5 |
0 |
| 31 |
3-2 (C_2) |
0 |
2 |
0 |
3 |
5 |
0 |
| 32 |
3-2 (C_3) |
0 |
0 |
2 |
3 |
5 |
0 |
| 33 |
3-1-1 (S_1) |
3 |
1 |
1 |
0 |
5 |
0 |
3000 |
|
C[4,1] * C[5,3] * C[3,2] * C[5,1] * C[5,1] |
| = |
4 * 10 * 3 * 5 * 5 |
| = |
12 * 250 |
| = |
3000 |
|
| 34 |
3-1-1 (S_2) |
3 |
1 |
0 |
1 |
5 |
0 |
| 35 |
3-1-1 (S_3) |
3 |
0 |
1 |
1 |
5 |
0 |
| 36 |
3-1-1 (H_1) |
1 |
3 |
1 |
0 |
5 |
0 |
| 37 |
3-1-1 (H_2) |
1 |
3 |
0 |
1 |
5 |
0 |
| 38 |
3-1-1 (H_3) |
0 |
3 |
1 |
1 |
5 |
0 |
| 39 |
3-1-1 (D_1) |
1 |
1 |
3 |
0 |
5 |
0 |
| 40 |
3-1-1 (D_2) |
1 |
0 |
3 |
1 |
5 |
0 |
| 41 |
3-1-1 (D_3) |
0 |
1 |
3 |
1 |
5 |
0 |
| 42 |
3-1-1 (C_1) |
1 |
1 |
0 |
3 |
5 |
0 |
| 43 |
3-1-1 (C_2) |
1 |
0 |
1 |
3 |
5 |
0 |
| 44 |
3-1-1 (C_3) |
0 |
1 |
1 |
3 |
5 |
0 |
| 45 |
3-1 (S_1) |
3 |
1 |
0 |
0 |
4 |
1 |
19200 |
|
C[4,1] * C[5,3] * C[3,1] * C[5,1] * C[32,1] |
| = |
4 * 10 * 3 * 5 * 32 |
| = |
12 * 1600 |
| = |
19200 |
|
| 46 |
3-1 (S_2) |
3 |
0 |
1 |
0 |
4 |
1 |
| 47 |
3-1 (S_3) |
3 |
0 |
0 |
1 |
4 |
1 |
| 48 |
3-1 (H_1) |
1 |
3 |
0 |
0 |
4 |
1 |
| 49 |
3-1 (H_2) |
0 |
3 |
1 |
0 |
4 |
1 |
| 50 |
3-1 (H_3) |
0 |
3 |
0 |
1 |
4 |
1 |
| 51 |
3-1 (D_1) |
1 |
0 |
3 |
0 |
4 |
1 |
| 52 |
3-1 (D_2) |
0 |
1 |
3 |
0 |
4 |
1 |
| 53 |
3-1 (D_3) |
0 |
0 |
3 |
1 |
4 |
1 |
| 54 |
3-1 (C_1) |
1 |
0 |
0 |
3 |
4 |
1 |
| 55 |
3-1 (C_2) |
0 |
1 |
0 |
3 |
4 |
1 |
| 56 |
3-1 (C_3) |
0 |
0 |
1 |
3 |
4 |
1 |
| 57 |
3 (S) |
3 |
0 |
0 |
0 |
3 |
2 |
19840 |
|
C[4,1] * C[5,3] * C[32,2] |
| = |
4 * 10 * 496 |
| = |
4 * 4960 |
| = |
19840 |
|
| 58 |
3 (H) |
0 |
3 |
0 |
0 |
3 |
2 |
| 59 |
3 (D) |
0 |
0 |
3 |
0 |
3 |
2 |
| 60 |
3 (C) |
0 |
0 |
0 |
3 |
3 |
2 |
| 61 |
2-2-1 (SH_1) |
2 |
2 |
1 |
0 |
5 |
0 |
6000 |
|
C[4,2] * C[5,2] * C[5,2] * C[2,1] * C[5,1] |
| = |
6 * 10 * 10 * 2 * 5 |
| = |
12 * 500 |
| = |
6000 |
|
| 62 |
2-2-1 (SH_2) |
2 |
2 |
0 |
1 |
5 |
0 |
| 63 |
2-2-1 (SD_1) |
2 |
1 |
2 |
0 |
5 |
0 |
| 64 |
2-2-1 (SD_2) |
2 |
0 |
2 |
1 |
5 |
0 |
| 65 |
2-2-1 (SC_1) |
2 |
1 |
0 |
2 |
5 |
0 |
| 66 |
2-2-1 (SC_2) |
2 |
0 |
1 |
2 |
5 |
0 |
| 67 |
2-2-1 (HD_1) |
1 |
2 |
2 |
0 |
5 |
0 |
| 68 |
2-2-1 (HD_2) |
0 |
2 |
2 |
1 |
5 |
0 |
| 69 |
2-2-1 (HC_1) |
1 |
2 |
0 |
2 |
5 |
0 |
| 70 |
2-2-1 (HC_2) |
0 |
2 |
1 |
2 |
5 |
0 |
| 71 |
2-2-1 (DC_1) |
1 |
0 |
2 |
2 |
5 |
0 |
| 72 |
2-2-1 (DC_2) |
0 |
1 |
2 |
2 |
5 |
0 |
| 73 |
2-2 (SH) |
2 |
2 |
0 |
0 |
4 |
1 |
19200 |
|
C[4,2] * C[5,2] * C[5,2] * C[32,1] |
| = |
6 * 10 * 10 * 32 |
| = |
6 * 3200 |
| = |
19200 |
|
| 74 |
2-2 (SD) |
2 |
0 |
2 |
0 |
4 |
1 |
| 75 |
2-2 (SC) |
2 |
0 |
0 |
2 |
4 |
1 |
| 76 |
2-2 (HD) |
0 |
2 |
2 |
0 |
4 |
1 |
| 77 |
2-2 (HC) |
0 |
2 |
0 |
2 |
4 |
1 |
| 78 |
2-2 (DC) |
0 |
0 |
2 |
2 |
4 |
1 |
| 79 |
2-1-1-1 (S) |
2 |
1 |
1 |
1 |
5 |
0 |
5000 |
|
C[4,1] * C[5,2] * C[3,3] * C[5,1] * C[5,1] * C[5,1] |
| = |
4 * 10 *1 * 5 * 5 * 5 |
| = |
4 * 1250 |
| = |
5000 |
|
| 80 |
2-1-1-1 (H) |
1 |
2 |
1 |
1 |
5 |
0 |
| 81 |
2-1-1-1 (D) |
1 |
1 |
2 |
1 |
5 |
0 |
| 82 |
2-1-1-1 (C) |
1 |
1 |
1 |
2 |
5 |
0 |
| 83 |
2-1-1 (S_1) |
2 |
1 |
1 |
0 |
4 |
1 |
96000 |
|
C[4,1] * C[5,2] * C[3,2] * C[5,1] * C[5,1] * C[32,1] |
| = |
4 * 10 * 3 * 5 * 5 * 32 |
| = |
12 * 8000 |
| = |
96000 |
|
| 84 |
2-1-1 (S_2) |
2 |
1 |
0 |
1 |
4 |
1 |
| 85 |
2-1-1 (S_3) |
2 |
0 |
1 |
1 |
4 |
1 |
| 86 |
2-1-1 (H_1) |
1 |
2 |
1 |
0 |
4 |
1 |
| 87 |
2-1-1 (H_2) |
1 |
2 |
0 |
1 |
4 |
1 |
| 88 |
2-1-1 (H_3) |
0 |
2 |
1 |
1 |
4 |
1 |
| 89 |
2-1-1 (D_1) |
1 |
1 |
2 |
0 |
4 |
1 |
| 90 |
2-1-1 (D_2) |
1 |
0 |
2 |
1 |
4 |
1 |
| 91 |
2-1-1 (D_3) |
0 |
1 |
2 |
1 |
4 |
1 |
| 92 |
2-1-1 (C_1) |
1 |
1 |
0 |
2 |
4 |
1 |
| 93 |
2-1-1 (C_2) |
1 |
0 |
1 |
2 |
4 |
1 |
| 94 |
2-1-1 (C_3) |
0 |
1 |
1 |
2 |
4 |
1 |
| 95 |
2-1 (S_1) |
2 |
1 |
0 |
0 |
3 |
2 |
297600 |
|
C[4,1] * C[5,2] * C[3,1] * C[5,1] * C[32,2] |
| = |
4 * 10 * 3 * 5 * 496 |
| = |
12 * 24800 |
| = |
297600 |
|
| 96 |
2-1 (S_2) |
2 |
0 |
1 |
0 |
3 |
2 |
| 97 |
2-1 (S_3) |
2 |
0 |
0 |
1 |
3 |
2 |
| 98 |
2-1 (H_1) |
1 |
2 |
0 |
0 |
3 |
2 |
| 99 |
2-1 (H_2) |
0 |
2 |
1 |
0 |
3 |
2 |
| 100 |
2-1 (H_3) |
0 |
2 |
0 |
1 |
3 |
2 |
| 101 |
2-1 (D_1) |
1 |
0 |
2 |
0 |
3 |
2 |
| 102 |
2-1 (D_2) |
0 |
1 |
2 |
0 |
3 |
2 |
| 103 |
2-1 (D_3) |
0 |
0 |
2 |
1 |
3 |
2 |
| 104 |
2-1 (C_1) |
1 |
0 |
0 |
2 |
3 |
2 |
| 105 |
2-1 (C_2) |
0 |
1 |
0 |
2 |
3 |
2 |
| 106 |
2-1 (C_3) |
0 |
0 |
1 |
2 |
3 |
2 |
| 107 |
2 (S) |
2 |
0 |
0 |
0 |
2 |
3 |
198400 |
|
4 * C[5,2] * C[32,3] |
| = |
4 * 10 * 4960 |
| = |
4 * 49600 |
| = |
198400 |
|
| 108 |
2 (H) |
0 |
2 |
0 |
0 |
2 |
3 |
| 109 |
2 (D) |
0 |
0 |
2 |
0 |
2 |
3 |
| 110 |
2 (C) |
0 |
0 |
0 |
2 |
2 |
3 |
| 111 |
1-1-1-1 |
1 |
1 |
1 |
1 |
4 |
1 |
20000 |
|
C[4,4] * C[5,1] * C[5,1] * C[5,1] * C[5,1] * C[32,1] |
| = |
1 * 5 * 5 * 5 * 5 * 32 |
| = |
1 * 625 * 32 |
| = |
20000 |
|
| 112 |
1-1-1 (NC) |
1 |
1 |
1 |
0 |
3 |
2 |
248000 |
|
C[4,3] * C[5,1] * C[5,1] * C[5,1] * C[32,2] |
| = |
4 * 5 * 5 * 5 * 496 |
| = |
4 * 62000 |
| = |
248000 |
|
| 113 |
1-1-1 (ND) |
1 |
1 |
0 |
1 |
3 |
2 |
| 114 |
1-1-1 (NH) |
1 |
0 |
1 |
1 |
3 |
2 |
| 115 |
1-1-1 (NS) |
0 |
1 |
1 |
1 |
3 |
2 |
| 116 |
1-1 (SH) |
1 |
1 |
0 |
0 |
2 |
3 |
744000 |
|
C[4,2] * C[5,1] * C[5,1] * C[32,3] |
| = |
6 * 5 * 5 * 4960 |
| = |
6 * 124000 |
| = |
744000 |
|
| 117 |
1-1 (SD) |
1 |
0 |
1 |
0 |
2 |
3 |
| 118 |
1-1 (SC) |
1 |
0 |
0 |
1 |
2 |
3 |
| 119 |
1-1 (HD) |
0 |
1 |
1 |
0 |
2 |
3 |
| 120 |
1-1 (HC) |
0 |
1 |
0 |
1 |
2 |
3 |
| 121 |
1-1 (DC) |
0 |
0 |
1 |
1 |
2 |
3 |
| 122 |
1 (S) |
1 |
0 |
0 |
0 |
1 |
4 |
719200 |
|
C[4,1] * C[5,1] * C[32,4] |
| = |
4 * 5 * 35960 |
| = |
4 * 179800 |
| = |
719200 |
|
| 123 |
1 (H) |
0 |
1 |
0 |
0 |
1 |
4 |
| 124 |
1 (D) |
0 |
0 |
1 |
0 |
1 |
4 |
| 125 |
1 (C) |
0 |
0 |
0 |
1 |
1 |
4 |
| 126 |
0 |
0 |
0 |
0 |
0 |
0 |
5 |
201376 |
|
計算過程の例
パターン5〜16の4-1構成は、あるマークでロイヤルに関連するカード(10,J,Q,K,A)を4枚含み、残りの1枚はそれ以外のマークでロイヤル関連カードが1枚あるという意味です。4枚の方はマークが4種類ありますのでC[4,1]、カードの数字は10,J,Q,K,Aの5個から4枚選びますのでC[5,4]となります。他の1枚は4枚で選ばれたマークを除いて3種類マークから1種類選びますのでC[3,1]、カードの数字は10,J,Q,K,Aの5個から1枚選びますのでC[5,1]となります。よって計算式は、C[4,1]
* C[5,4] * C[3,1] * C[5,1] となります。4-1構成が12パターンあるのはマークに関係する、C[4,1]とC[3,1]の組合せがあるからです。(4*3=12)
18の構成別に組合せ数をまとめました。構成番号2〜3はロイヤルリーチとなり、940通り存在しますので出現確率は約1/2765と思ってた以上に出やすいことがわかりますね。(940÷2598960)
| 構成番号 |
構成名 |
関連数 |
組合せ |
| 1 |
5 |
5 |
4 |
4 |
| 2 |
4-1 |
4 |
300 |
940 |
| 3 |
4 |
640 |
| 4 |
3-2 |
3 |
1200 |
43240 |
| 5 |
3-1-1 |
3000 |
| 6 |
3-1 |
19200 |
| 7 |
3 |
19840 |
| 8 |
2-2-1 |
2 |
6000 |
622200 |
| 9 |
2-2 |
19200 |
| 10 |
2-1-1-1 |
5000 |
| 11 |
2-1-1 |
96000 |
| 12 |
2-1 |
297600 |
| 13 |
2 |
198400 |
| 14 |
1-1-1-1 |
1 |
20000 |
1731200 |
| 15 |
1-1-1 |
248000 |
| 16 |
1-1 |
744000 |
| 17 |
1 |
719200 |
| 18 |
0 |
0 |
201376 |
201376 |
| 合計 |
- |
- |
2598960 |
2598960 |
|
|