think easy - combinatorial solution 回复：谁能用图论来解这道题？恳请牛人出着。

来源: mathg 于 2010-08-15 21:46:19 [档案] [旧帖] [给我悄悄话] 阅读数 : (145 bytes)

72.

First permute 135 = 3!. For each permutation, place 6 and avoid adjacent with 3 = 2, then place 24=c(2,3)*2!=6 So tatol = 6*2*6 = 72

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