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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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