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3. Prove that for every integer n, if 3|n2 then 3 n. You may use the fact that if u is an integer, then (32)
3. Prove that for every integer n, if 3|n2 then 3 n. You may use the fact that if u is an integer, then (32) iff there is a k e Z such that either I = - 3k + 1 or x=3k + 2
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