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标题: OG147 [打印本页]

作者: liushuan78 时间: 2006-9-20 06:41 标题: OG147

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?

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