变色次数为２的概率: (M!N!(M+N-2))/(M+N)!

来源: wxcfan123 于 2012-12-30 11:22:13 [旧帖] [给我悄悄话] 本文已被阅读：次

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变色次数为２的概率: (M!*N!*(M+N-2))/(M+N)!