回複：details? please!

來源: jinjing 於 2010-04-16 16:00:53 [] [舊帖] [給我悄悄話] 閱讀數 : (221 bytes)
回答: 72=(5!-4!*2) 由 jinjing 於 2010-04-15 13:26:38

I use graph doing this question.6 is spacial,it should be between in the 1and 5.We get 5! If 6 out get new and cancel
cases are the same.Put 2,4 together 1,5,3 and 24 ,we have 2*4!cases should be canceled....Thank you.

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• 2*4!可以理解，5!仍不太明白。anyway, thank you! -皆兄弟也- ♂ 給 皆兄弟也 發送悄悄話 皆兄弟也 的博客首頁 (0 bytes) () 04/16/2010 postreply 20:55:59

• 回複：2*4!可以理解，5!仍不太明白。anyway, thank you! -jinjing- ♀ 給 jinjing 發送悄悄話 (161 bytes) () 04/17/2010 postreply 05:43:11

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