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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。9 Y- a) i" k* j/ F' F. I+ g; @
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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。. p5 q; _6 u; L! N
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严格来计算德扑概率应该这样:
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7 h# {( _7 l! U( J- P- O+ u9 O$ a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%。8 K5 R$ q" w' ]8 l, [
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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,! T Y, S- Q; W4 T3 D+ g) i$ m# e$ ]
& p/ ?3 x0 e7 R* O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。
2 l$ m, H% L# u+ g, w$ H( ^/ F6 l( h4 k% Z3 f. W0 }. J
这是四二法则中的“二”。
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' r/ }: H" L1 I; @! I% p6 x0 ?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。( N# V$ a9 Y- m6 N& a* l, q9 X
0 p) w* }3 d* M( h$ R比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。# A: `4 v, k3 M' k& ~
- B* \1 m2 s5 a; k3 Z/ c6 ~不一样的是,你有两轮机会来等5或者10,共8张想要的牌% l# \% ?( S/ h/ o. i' j
4 l+ u: X, Q- h那么两轮内你中顺子的概率为:
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# {: r& M" D" k0 W# m# `1-(47-8)/47*(46-8)/46=0.3145,即约为31%。
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0 Q4 n5 _; _4 t. l' q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。, |9 k0 J' g; G6 ~# @
" A8 w# a0 i3 O0 p这就是四二法则中的“四”。/ p9 @6 y7 x } x$ R" n& }
6 a' [( |1 [$ D. ] P" z; H' A: G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。1 h" h6 h" w9 I" v1 I& Y
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