Prove gcd value, Mathematics

Let a, b, c 2 Z+.

(a) Prove that if a|b, then ac|bc for all c.

(b) If a|bc, can you conclude that either a|b or a|c? Justify your answer with a proof or a counter example.

(c) Prove that gcd(a, a + b) = gcd(a, b).

 

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