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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 z& M# l, |1 i9 v, P' F0 S
. H/ {5 a1 b' A: \& ~6 B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。; w! v3 P- V4 i/ t5 S' F6 E
4 X: h0 l. E/ T: c( z0 z6 Y( W严格来计算德扑概率应该这样:1 s9 V y6 H* p( [3 |" N, s7 P
. {: ?6 ^7 \8 y' ?. ?( _+ g
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;/ w: n. T) I) P8 `! |2 M2 {
' q+ |5 D* p+ @) t( i1 }% x% W
你想要的牌是4张5和4张10,共4+4=8张。) p' y; s. P/ W0 U4 Z6 ^
, ]+ \& m2 y/ v2 I; j% f* f6 A
那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。 ?" }" Q/ R: v+ f
! L* b7 e/ t1 |3 @# J
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,
7 {! v4 T9 h) x7 J- i- M
. V: a/ S5 L H$ b) G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。: V/ F- a2 r9 g# P
- W2 ?9 O k1 V' @- o! W这是四二法则中的“二”。" }5 J1 R2 K7 L* G& j" ]& D
+ i) F) @8 B- O7 i
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。" H: P" j0 n8 Z2 h- b F& Z
4 J8 A o5 [. M比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。
# }" M' o$ p0 u2 q; X" ?; V! P' f$ k9 R% ]- C2 h
不一样的是,你有两轮机会来等5或者10,共8张想要的牌- L2 [- S$ c! c- m2 }$ q
# x8 M: P& W' W" ]' q那么两轮内你中顺子的概率为:& V+ \$ j ` m P
4 c4 S; T5 G/ q6 g
1-(47-8)/47*(46-8)/46=0.3145,即约为31%。 G5 b4 v' [& B9 k
" c, ^) B- X- v, @: z
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。5 r: K7 ~! D: D
& x& u* z+ ?* O
这就是四二法则中的“四”。( R1 U0 v9 H+ u" a
/ |* `4 B8 E, q# z6 m' f
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。4 c9 C0 L6 m) _5 |7 H
7 c2 j+ a+ }* K; E5 w' A
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