400-1816-180
本題由lindy提供
If n is a positive integer less than 200 and
(A) Two
(B) Three
(C) Five
(D) Six
(E) Eight
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答案：
B
N是少于20
N的可能質因數有幾個不同的值？
14n/60化簡：7n/30； n 必須滿足是30的倍數才可以保證14n/60是整數：所以n可以等于30 60 90 120 150 180
這些數的質因子為：2 3 5 全部都是2 3 5 那么只有3個
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