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

mathg 2010-08-15 21:46:19 ( reads)

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

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