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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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. E; y" K$ g; f8 ^ V# S; x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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你想要的牌是4张5和4张10,共4+4=8张。. d6 u; k7 ~8 k
, {5 j) j9 D) J8 Z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,
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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。$ e5 [1 g: @: b
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这是四二法则中的“二”。
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: s! z. G/ _- |6 K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。# g* J- w9 f$ ~/ H7 L8 f$ T
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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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) a3 q/ P" q. x$ C3 ^那么两轮内你中顺子的概率为:+ r1 W( d% I2 f0 I$ V& ?* K
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1-(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。7 H4 s' X" Y' F0 d% N+ x8 h
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