Question: 1. Prove that if da and db, then d | 2. Prove that if d | a and d | b, then d (ax+by)

1. Prove that if ( d mid a ) and ( d mid b ), then ( d^{2} mid a b ). 2. Prove that if ( d mid a ) and ( d mid

1. Prove that if da and db, then d | 2. Prove that if d | a and d | b, then d (ax+by) for any integers x and y. 3. Prove that if m | (a - b), then m | (a - b) for any natural number n. ab.

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