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a) Prove that if (n) is not divisible by 3 then (n 2 -1) is divisible by 3 b) Show that 5 n is not
a) Prove that if (n) is not divisible by 3 then (n2 -1) is divisible by 3
b) Show that 5n is not divisible be 3 for any positive integer, n
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