[求助]GMATPREP又一题~~~HELP~~

hebbechou

If r and s are positive integers,is r/s an integer?

1. Every factor of S is also a factor of R.

2.Every prime factor of S is also a prime factor factor of R.

选A。不明白为什么条件2不行？？请指教~~THX

albertes

比如S=5*5*2，R=5*2，那么r/s不是整数。

hebbechou

谢谢大虾~~