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http://acm.pku.edu.cn/JudgeOnline/showmessage?message_id=89830

Posted by huangkun at 2008-07-17 12:24:39 on Problem 3604 and last updated at 2008-07-17 12:25:49
In Reply To:啥? Posted by:cuiaoxiang at 2008-06-30 14:30:10
C^m_n=\frac{n!}{m!(n-m)!}

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