Question: 6.4.4. Let a, 5,11 be three integers, with d 75 I]. For each statement, decide if it is true or false. Provide a. short proof

6.4.4. Let a, 5,11 be three integers, with d 75 I]. For each statement, decide if it is true or false. Provide a. short proof or a counterexample. (a) [f tile and dlb, then dl(a + b). (b) If d|(a + b), then {u and d|b. (c) [f d|(a + b), then tile or (ill). (d) [f d|(a + b), then either at divide: both a and b, or d does not divide (1 nor 5

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