don't you think

來源: passenger101 於 2009-01-19 14:14:56 [檔案] [博客] [舊帖] [給我悄悄話] 閱讀數 : (109 bytes)

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

把n個球放在3個盒子中的2個有3*2^n種方法 should include the possibility that 把n個球放在3個盒子中的1個?

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