If the total people is 7, what is the number of 3+4 part? Is any

来源: wxcfan123 2012-05-05 08:08:56 [] [旧帖] [给我悄悄话] 本文已被阅读: 0 次 (0 bytes)
本文内容已被 [ wxcfan123 ] 在 2012-06-08 15:15:07 编辑过。如有问题,请报告版主或论坛管理删除.
回答: A math question万斤油2012-05-03 07:24:23

所有跟帖: 

回复:If the total people is 7, what is the number of 3+4 part? Is -jinjing- 给 jinjing 发送悄悄话 (120 bytes) () 05/05/2012 postreply 10:04:16

thanks. So the general solution should be -wxcfan123- 给 wxcfan123 发送悄悄话 (416 bytes) () 05/06/2012 postreply 08:28:32

F(N) = SUM_(n1 + n2 + ... nk=N, ni >=3 ) {[C(N, n1)C(N-n1,n2).. -jinjing- 给 jinjing 发送悄悄话 (66 bytes) () 05/06/2012 postreply 09:37:01

... {[C(N, n1)C(N-n1,n2)..C(N-n1-n2-...n(k-1,nk)/D(n1,n2m,,,nk)] -jinjing- 给 jinjing 发送悄悄话 (0 bytes) () 05/06/2012 postreply 09:41:59

请您先登陆,再发跟帖!