### Possible Answer

If n is a positive integer, is n^2 - 1 divisible by 24? (1) n is a prime number --> if n=2, then the answer is NO but if n=5, then the answer is YES. - read more

Worked example of basic divisibility tests ... Actually, divisibility by 7 & 8 is quite easy once you get the hang of it. - read more

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