elementary number theory - Prove that $n(n^2 - 1)(n + 2)$ is divisible by $4$ for any integer $n$

Monday, December 25, 2017

elementary number theory - Prove that $n(n^2 - 1)(n + 2)$ is divisible by $4$ for any integer $n$

Prove that $n(n^2 - 1)(n + 2)$ is divisible by $4$ for any integer $n$

I can not understand how to prove it. Please help me.

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