求助prep数学题！！急！！谢谢！！

liuyanchu61 · 发表于 2011-4-17 19:51:40

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If m is a positive odd integer between 2 and 30, then m is divisible by how many different positive prime numbers?

(1) m is not divisible by 3.

(2) m is not divisible by 5.

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sdcar2010 · 发表于 2011-4-17 21:06:26

3,5,7,9,11,13,15,17,19,21,23,25,27,29

Note, the above has many prime numbers and multiples of 3 and/or 5.

But if both 1) and 2) are right, you only have prime numbers left.

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liuyanchu61 · 发表于 2011-4-17 21:08:26

thank you but the answer on prep is A ? Why?

求助prep数学题！！急！！谢谢！！

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