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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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严格来计算德扑概率应该这样:( f3 ^/ ~8 J' x; W1 @
8 t0 p7 L% Q5 O( \
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。
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那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。, k+ G O J9 ]6 U
3 A, Y" Q, Q6 O4 b0 O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,' O; \/ _5 B# Q c$ i! h E c
8 R# d+ G1 O6 e: q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。: Z$ J% U$ e8 u6 H2 O
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这是四二法则中的“二”。
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2 X, v/ E }( _0 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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5 C4 Z* t' a2 b" p) K: C% E比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。: }7 _! Q$ p) h1 a4 [( \7 s
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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2 D$ v% Z& M# j' S6 [: u1 d9 Q5 s
! T9 C0 ]8 o3 S7 t* ^ G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%。9 T" R4 p% P) }' T; I6 [5 S4 i
/ j0 A% g7 s* ~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。/ e* G0 f- x+ i1 B
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这就是四二法则中的“四”。
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2 _) Z3 A/ \& `8 P- k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。( o% t) l. K) e/ W3 U! \6 I
# G1 B- }8 ]( g# ~% k: \% R
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