OG黄147 DS

wanghaiping0

og ds 147
If n is a positive integer, is n^3-n divisible by 4?
(1) n=2k+1, where k is an integer
(2) n^2+n is divisible by 6
key: A
but if n=1 in (1), is 0 divisible by4?

I choose E

wanghaiping0

og ds 147
If n is a positive integer, is n^3-n divisible by 4?
(1) n=2k+1, where k is an integer
(2) n^2+n is divisible by 6
key: A
but if n=1 in (1), is 0 divisible by4?

listen2000

以下是引用wanghaiping0在2006-8-28 15:45:00的发言：

og ds 147
If n is a positive integer, is n^3-n divisible by 4?
(1) n=2k+1, where k is an integer
(2) n^2+n is divisible by 6
key: A
but if n=1 in (1), is 0 divisible by4?

I choose E

Faint

0 can be divisible by any number except 0 itself.