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Let a, b, c be integers. Give a proof for these facts about divisors: (a) If bla, then bac. (b) If ba and c|b,

Let a, b, c be integers. Give a proof for these facts about divisors: (a) If bla, then bac. (b) If ba and c|b, then ca. (c) If ca and cb, then c (ma+nb) for any integers m, n.

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