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

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

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I'm sorry,I think n=N,at first. -jinjing- 给 jinjing 发送悄悄话 (0 bytes) () 06/17/2010 postreply 15:08:21

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