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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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. P* K1 X+ E G2 X7 @/ T严格来计算德扑概率应该这样:
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@) g1 l' c# x* `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;6 j# e/ i: m7 _. v; M1 O
! W3 |! H3 X, X$ U你想要的牌是4张5和4张10,共4+4=8张。
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9 |& ?9 o- r9 d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,) r8 d( m4 g8 i5 X3 g
% d+ [- t2 {# Q+ |& d
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。; \( D* j9 Z- L- p( x6 L
! u% c+ c: r: D- h% A& r) n这是四二法则中的“二”。
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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。
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比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。
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不一样的是,你有两轮机会来等5或者10,共8张想要的牌* Z2 f; W: x8 s4 l8 C+ m* h9 P4 n
8 I1 M1 B3 {) {% T5 z% V那么两轮内你中顺子的概率为:
! q( J6 Z. X) D' D9 W. x6 l5 ^2 |5 l* y s L6 f, x6 d! M, |
1-(47-8)/47*(46-8)/46=0.3145,即约为31%。% l8 V: k1 f: c4 e" T
5 O# g B0 ?# C5 y8 N" Q
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。
. ^8 v2 G8 b2 Y" ?- W! e D& M: \
( b, ]0 v- B l. @& Q这就是四二法则中的“四”。/ [ Q) R5 ~0 V' p$ q: w9 T' V
7 G6 w2 L" f& |3 g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。
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