[問題] pp1-ds 159
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.
請問一下 為何2個一起考慮就可以
所以答案C
謝
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