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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。4 F: x$ v, P" K5 c0 h+ N 
6 s2 k: X# j& \ 
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。" |5 g. G8 w/ f2 ]7 i8 E, c 
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严格来计算德扑概率应该这样: 
3 M7 y' O  Y7 @+ y) e" k, x9 d9 `" j, J* _& H- h 
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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* r5 |( Y; G! h" \" H你想要的牌是4张5和4张10,共4+4=8张。! P0 g) c4 k8 u' G 
 
# P0 v* b$ w: j* r! k. S那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。4 M6 ?1 B- O+ Y$ { 
 
0 G' C- L( k, f% K, b+ [. Y9 S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,. N/ H7 {- q/ X! m) y/ Y 
 
  b1 j* s3 I; f8 J" Z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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( m1 W4 `0 f) Y这是四二法则中的“二”。3 U2 p( D/ h6 C% W9 d( _1 `- i 
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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" p0 @2 H1 A) M; b1 X 
+ |9 L* F  H0 E5 w+ O: r 
比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。" {( `& s/ S  s3 W 
& C* j" X) w' t3 u 
不一样的是,你有两轮机会来等5或者10,共8张想要的牌6 x% J5 p% P' c' k+ Y7 d 
 
- p( b: |$ k6 y那么两轮内你中顺子的概率为:4 e$ l# R/ e( U3 K 
 
: d  s/ E8 D  r  W: l8 E1-(47-8)/47*(46-8)/46=0.3145,即约为31%。 
. G  T" H( q: @4 J( @8 z% y! ? 
; h% s' L* g8 y( Q9 {! 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。 
! X4 Z. p) P; d0 E 
3 H2 T6 t1 E$ V  f, P6 r这就是四二法则中的“四”。% M# Q0 E, U4 a% h! _4 r; m/ {+ n 
 
+ m( m0 r' e- z$ W& d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。 
- u8 i: g$ a# z* R/ L, H. u 
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