回复：请教高中数学题

来源: gguyy 于 2009-03-15 19:14:42 [旧帖] [给我悄悄话] 本文已被阅读：次

C(13,2)*C(4,2)*C(4,2)*C(11,1)*C(4,1)/C52,5)=0.047539

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