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Re:看不明白题目哦In Reply To:Re:看不明白题目哦 Posted by:saomin at 2005-10-03 10:34:13 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)+…… Followed by: Post your reply here: |
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