Can (n + 7) 2 - (N-5) 2 be divisible by 24 when n is a natural number? Give reasons
Because (n + 7) 2 - (N-5) 2 = (2n + 2) (n + 7-N + 5) = 24 (n + 1), and N is a natural number, it must be divisible by 24
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