求PREP-DS-2-183 解

jesuisdesole

183.
                17831-!-item-!-187;#058&011633

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.

答案为 A

完全不明白这个被3和5整除有什么关系.....汗

xxy870128

确定答案是A吗

jesuisdesole

以下是引用xxy870128在2008-8-18 8:03:00的发言：
确定答案是A吗

确定是Ａ

这个我已经想明白了，多谢：）