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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) E7 _) \% s 
 
4 }2 w7 i+ n* L( o) M( a5 C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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  ^# S1 A5 p6 N, r* i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;! U. }" e3 g' W" I! r9 f4 E- b 
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你想要的牌是4张5和4张10,共4+4=8张。 
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* j! e3 S' n; o- \那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。$ w& _7 w- f9 A! w6 I4 G 
 
2 i+ u! v$ |: A6 f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,! W6 l8 d, |. j" k. b3 Z2 G 
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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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3 q' f8 A7 g+ l& a0 V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。- q) D. ?9 }6 {& M! {; A) r9 v 
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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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5 O" d3 q; {0 O& n& z. s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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3 A9 Y* b; i4 x) l9 n0 Y1-(47-8)/47*(46-8)/46=0.3145,即约为31%。- F& B) U4 C6 z) ]7 _& q# L 
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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。; U" P+ b; y* h# }. ?1 n 
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这就是四二法则中的“四”。 
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8 g6 W+ |* H- [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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