don't you think

来源: passenger101 于 2009-01-19 14:14:56 [档案] [博客] [旧帖] [给我悄悄话] 阅读数 : (109 bytes)

回答: Is this problem related to the problem of bins and balls? 由 endofsuburbia 于 2009-01-16 10:22:36

把n个球放在3个盒子中的2个有3*2^n种方法 should include the possibility that 把n个球放在3个盒子中的1个?

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