變色次數為２的概率: (M!N!(M+N-2))/(M+N)!

來源: wxcfan123 於 2012-12-30 11:22:13 [舊帖] [給我悄悄話] 本文已被閱讀：次

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變色次數為２的概率: (M!*N!*(M+N-2))/(M+N)!