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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。2 f$ B$ f( b1 i- c% a( f2 p
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严格来计算德扑概率应该这样:
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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;
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5 |# n% g/ l! n/ V你想要的牌是4张5和4张10,共4+4=8张。% ~" g! p0 m7 J* }& L0 C) m4 F
+ l# E @5 `9 a% R4 C$ E6 O那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。 \" a$ d% D8 h) q
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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," J# V6 G5 C. Q, p% G$ y
# @+ |; q+ F5 }/ M% G5 f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。/ H; i' h! i; Z
7 `3 S7 {, k/ Q/ ^这是四二法则中的“二”。* ^0 V c9 l6 k
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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。+ i7 e# D) Y r" `) C9 A
: i5 g8 ^; d6 q: @/ R. E4 a- ]: j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:4 f6 V; {* A9 P ~6 f9 n: F
, g# O' C1 V7 j9 ?7 t8 [4 H1-(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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这就是四二法则中的“四”。
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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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