順:10*4^5=0.003940038-0.000015391=0.003924647,

來源: Jinjing 於 2010-04-25 14:21:57 [] [舊帖] [給我悄悄話] 閱讀數 : (638 bytes)

回答: 一副52張撲克牌，洗勻之後揭上麵5張， 由 金屬米 於 2010-04-22 19:41:28
同花順:10*4/C(52,5)=0.000015391

四頭:C(13,1)*C(4,4)*C(48,1)/C(52,5)=.000240096

同花:C(13,5)*C(4,1)/C(52,5)-0.000015391=0.001965401

3,2(Fullhouse):）C(4,3)*C(4,2)*P(13,2)/C(52,5)=0.00140576

順:10*4^5=0.003940038-0.000015391=0.003924647,

三：C(13,1)*C(4,3)*C(48,1)*C(44,1)/C(52,5)=.042256903

2對：C(13,2)*C(4,2)*C(4,2)*C(44,1)/C(52,5)=0.047539016

隊:C(4,2)*C(48,1)*C(44,1)*C(40,1)*P(2,2)/C(52,5)=0.390063718

荒:C(52,1)*C(48,1)*C(44,1)*C(40,1)*C(36,1)/P(52,5)-0.000015391-0.001965401-0.003940038=0.501162003

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