任取（不分次序）k個不同的小於等於N的正整數的取法有C(N,k)種，求其和為M的取法有多少種？

來源: 皆兄弟也於 2010-06-11 09:43:25 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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