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标题: Prep-DS-35 [打印本页]

作者: shefff 时间: 2010-6-22 11:49 标题: Prep-DS-35

If p and n are positive integers and p > n, what is the remainder when p2 - n2 is divided by 15 ?

(1) The remainder when p + n is divided by 5 is 1.

(2) The remainder when p - n is divided by 3 is 1.
麻烦各位大侠帮我看看这题PREP怎么解

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