求教ps-1 111

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楼主

发表于 2007-9-15 13:13:00 | 显示全部楼层

求教如何迅速解答该题:

If n is a positive integer less than 200 and 14n/60 is an integer, then n has how many different positive prime factors?

a. two b. three c. five d. six e. eight

除了代入法外.(太费时间了) ,还有无迅速解题的办法.

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所属分类: GMAT考试