Apparently the easiest method is to use proof by exhaustion, but I've no idea how. Any ideas/solutions?
Prove that $n^4−1$ is divisible by 5 when n is not divisible by 5.
2026-04-08 21:04:32.1775682272
Prove that $n^4−1 $ is divisible by 5 when n is not divisible by 5.
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