作者htbk (小小艾佛森)
看板GMAT
标题[问题] GWD数学问题
时间Thu Aug 21 21:52:49 2008
If n is a positive integer and r is the remainder
when (n-1)(n+1) is divided by 24, what is the value of r?
(1) 2 is not a factor of n.
(2) 3 is not a factor of n.
答案是 : C
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