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答案：
A
问n有几
条件一 告诉你a、b为不同的质数，那么n所含有的质数就为1 b b^2 b^3 a ab ab^2 ab^3 a^2 a^2*b a^2*b^2 a^2*b^3 a^3 a^3*b a^3*b^2 a^3*b^3 a^4 a^4*b a^4*b^2 a^4*b^3 是可以求出来一共有20个因子的 充分
条件二 说n当中只含有5和7这两个质因数，无法判断有几个5 几个7 所以不充分 选A
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