回复：first Q : 969 second Q:10626

来源: guest1000 于 2010-09-08 12:23:06 [] [旧帖] [给我悄悄话] 阅读数 : (68 bytes)
回答: first Q : 969 second Q:10626 由 jinjing 于 2010-09-07 21:39:24

The answer to the second question should be C(19,4)+C(19,3)=C(20,4).

所有跟帖： 

• I mean second Q; We can put 0 for 4 cases.So, the -jinjing- ♀ 给 jinjing 发送悄悄话 (19 bytes) () 09/08/2010 postreply 13:10:35

请您先登陆，再发跟帖！