任取（不分次序）k个不同的小于等于N的正整数的取法有C(N,k)种，求其和为M的取法有多少种？

来源: 皆兄弟也于 2010-06-11 09:43:25 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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