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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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严格来计算德扑概率应该这样:
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. d; N- P( r( l+ b- f7 k* G% T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;
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" K8 u7 Z: l8 Y! s0 t你想要的牌是4张5和4张10,共4+4=8张。
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- r2 I' g! J) i# h* _, h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,! ^6 |9 ^, D0 e5 C' s1 y
/ g3 B, }- U+ R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。
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这是四二法则中的“二”。3 E# L" E6 |( {5 S* | P
1 r& D8 r: t5 g( t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。1 h+ g3 W& ?% g& M9 k- L
% U" b% C- z: A y3 J& T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
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那么两轮内你中顺子的概率为:
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$ U7 b) u8 t7 V/ d8 g9 M- W& L$ r1-(47-8)/47*(46-8)/46=0.3145,即约为31%。
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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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" e1 R$ a3 b% C3 w! [这就是四二法则中的“四”。
& p2 `: b8 S$ ]+ w( x. i+ w4 c+ c3 C0 U* a. ]
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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