prep-ds-2-21

follie

prep-ds-2-21.

1407-!-item-!-187;#058&000929

 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?

specman

我的理解：2n的因子数是n的因子数的2倍。

SHJDHKBB9

同意楼上翻译.

lxw19

有谁能说说这道题怎么做出来的？万分感谢

lxw19

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