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回复:details? please!

jinjing 2010-04-16 16:00:53 ( reads)

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.

跟帖(2)

皆兄弟也

2010-04-16 20:55:59

2*4!可以理解,5!仍不太明白。anyway, thank you!

jinjing

2010-04-17 05:43:11

回复:2*4!可以理解,5!仍不太明白。anyway, thank you!