這是原題麽？還是翻譯的版本?

來源: 我稀飯搗亂 於 2007-01-24 08:22:23 [] [舊帖] [給我悄悄話] 閱讀數 : (293 bytes)

看到你寫的答案，會想到這個, 不過也是猜得
6^5 = 7776
Variations (without repetition): n!/(n-k)!
Variations with repetition: nk

Combinations (without repetition): n!/k!(n-k)! or (n above k)
Combinations with repetition: (n+k-1)!/k!(n+k-1-k)! or (n+k-1 above k)



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