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怎么求呢?

Posted by alpc02 at 2006-10-23 18:35:04 on Problem 2625
In Reply To:Re:看不明白题目哦 Posted by:ahoaho at 2005-10-05 23:45:17
> 每张彩票上的数字为1-n之间的一个数,用p(k)k次抽出的数恰好包含n个不同的数,
> 求:
>   p(n)*n+p(n+1)*(n+1)+p(n+2)*(n+2)+……

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