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“四二法则”是一种估算概率的方法,让你能快速计算你想要的牌出现的概率。
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比如:桌子上的牌是A-6-7-Q,而你的手牌是8-9。你想要再来一张5或者10来凑成顺子,但你只剩最后一轮机会。
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1 X# G: W( T w# k2 ^严格来计算德扑概率应该这样:# ?, [: j$ A3 T3 J# ^( M# b
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一副牌52张,去掉翻牌3张,转牌1张,手牌2张,剩下52-3-2-1=46张;! C+ h! T8 j% U' f- c% E' }# n
! k+ ?/ h1 L7 i0 X4 Y0 g$ L你想要的牌是4张5和4张10,共4+4=8张。. I+ [. g6 ~2 l( I
2 Z6 g0 Q+ D6 D7 n那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。
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你可能觉得这样计算会比较麻烦,于是就有了四二法则,即:你想要的牌有4+4=8张,3 J* o2 r" d, L* M7 N+ S
- K2 f' g0 H% y- z2 i只剩最后一轮机会,所以让8*2=16,即你有约16%的机会中顺子,与上述17%基本近似。 K+ u" \: {* {2 S# R
: y* w% x1 P0 M4 t+ p U这是四二法则中的“二”。3 t2 A8 h' d6 c, {
2 g0 r9 x3 [3 U1 E当然,如果你还有两轮机会的话,即河牌圈与转牌圈,情况是这样的。# E0 s0 o9 V5 Y0 a" P
7 u% e7 H) Z( ^- c比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。 a5 v7 f1 b6 a. J
4 d Q' ^3 C% }不一样的是,你有两轮机会来等5或者10,共8张想要的牌+ N+ T( B( G4 O+ D2 X0 [7 r
0 ~ A; J: m' h! V6 o/ W3 P那么两轮内你中顺子的概率为:
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6 X# v! G0 w! |+ s. r1-(47-8)/47*(46-8)/46=0.3145,即约为31%。& T- g# I5 p. Y- I ]7 ?
# ?0 |. F+ v; ?. W D$ V( T8 P那么利用四二法则,8*4=32,即你约有32%的机会中顺子,是不是跟理论值也很接近。
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这就是四二法则中的“四”。
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: f- `) k6 A. M4 u, E总之就是,先想好自己想要的牌的张数,然后,还有两轮机会就乘4,还有一轮机会就乘2,得到的就是你想要的牌接下来会出现的概率。接着,根据真人德扑圈的游戏玩家以及战况来决定接下来该怎么办。利用好四二法则,可以帮你快速估算概率。/ p1 j' r* q7 T% @, b' V2 c3 }
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