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标题: 问一道prep数学。。今天第二题了。。 [打印本页]

作者: leonQ 时间: 2010-12-27 22:16
标题: 问一道prep数学。。今天第二题了。。
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) n is not divisible by 2.

(2) n is not divisible by 3.

答案是C, 有没有达人能给讲讲做法啊，不要代入数字的那种，谢谢~~~

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