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sum{(-1)^(m-k)*c(m,k)*k*(k-1)^(n-1)} (1<=k<=m)In Reply To:B是m!*{n-1,m-1}？{n,k}是第二类Stirling数…… Posted by:frkstyc at 2007-11-18 13:14:35 Followed by:
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