prep-ds-2-21

hlyndons

prep-ds-2-21.

 

 Is the integer n odd?

(1) n is divisible by 3.

(2) 2n is divisible by twice as many positive integers as n.

我选E, 答案是B

条件(2), 怎么理解? 是不是说2n能被2n整除?

aurora2008

同意楼上翻译.

无及天下

我的理解：2n的因子数是n的因子数的2倍。