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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。7 G" \9 c& J+ i4 ?
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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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" W# J8 K+ X v( ]3 x1 N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 _! u$ f0 Y3 F; v你想要的牌是4张5和4张10,共4+4=8张。
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& D6 I$ a+ j( r: c I那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。# N- O+ Q2 Y9 F; J# W! R: w r
) p* |1 i! m7 r; r ~- w; n+ H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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" w# ^: I+ E' j& E7 `- X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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; u9 }. h( R( s$ W9 e: o* S6 C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。0 ^4 {2 V! t/ w, r9 n
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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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1-(47-8)/47*(46-8)/46=0.3145,即约为31%。6 Q% q6 U1 x9 v& U1 x C5 y
3 z* V: f7 @% t# v' g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。+ r' x, H5 g* Q4 G1 [) J
) F D3 v; E' y6 J G7 s% p6 Z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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