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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。
* X* S F( L5 T7 }5 y [- F+ I( H0 S. g
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。
7 ]* o; j1 d& v9 Q Q9 h2 H* G6 ?" M. \8 S6 z
严格来计算德扑概率应该这样:6 n* Q4 S$ X" L9 D# t2 o+ e
3 W2 ]1 b) `6 F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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- \9 F" f% ?/ j) l你想要的牌是4张5和4张10,共4+4=8张。
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" p$ B8 R$ u' b, C2 W那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。' T* S5 l" s: i+ j/ M5 a x
6 ^* e$ [4 z& S/ f) u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,
- q% H6 b& H! X5 ~: i9 A1 i# p8 W" c1 q X$ T. m! L# b+ G" n
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”。
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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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3 L8 x0 ^3 b+ ]6 X/ i# b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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# v2 y# ~ V5 J* c$ M+ [那么两轮内你中顺子的概率为:5 s& W9 ~" c+ e* o) A8 o
4 e) L: Q6 U: a* v( ^0 {! V1-(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。) b% w3 F' c1 b% w; C |
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这就是四二法则中的“四”。8 @3 P z i2 }8 l5 U4 S4 y/ A9 m
$ D1 {9 }; d) 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。* S6 S! e: Q, J
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