一分钟教你学会算出德州扑克抽牌的概率
“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。
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。
严格来计算德扑概率应该这样：
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；
你想要的牌是4张5和4张10，共4+4=8张。
那么此时，你在河牌中顺子的概率为：8/46=0.1739，即17%。
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，
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。
这是四二法则中的“二”。
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。
比如桌子上翻牌为A-6-7，你的手牌依旧是8,9。
不一样的是，你有两轮机会来等5或者10，共8张想要的牌
那么两轮内你中顺子的概率为：
1-(47-8)/47*(46-8)/46=0.3145,即约为31%。
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。
这就是四二法则中的“四”。
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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