400-600-1123
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答案：
E
1和2一定是
有问题的 都是整数
那验证3：3里面的分母多了一个5*4*3*2*1 分母上面剩下的是12*11*10*9*8 那就看分子有没有分母的倍数，每个数都有 那么
肯定也是整数 不会出现除不尽的情况 
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