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m people and n rooms: C(m+n-1,m), instead of C(m+n-1,n).

皆兄弟也 2010-06-17 10:00:40 ( reads)

C(m+n-1,m) = C(m+n-1,n-1)

跟帖(1)

jinjing

2010-06-17 15:08:21

I'm sorry,I think n=N,at first.