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标题: 请问这题该怎么解啊？ [打印本页]

作者: red1358 时间: 2013-11-10 17:58
标题: 请问这题该怎么解啊？
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.

请问是套数字进去试试吗？还是有其他思路？

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