Question: Problem 6) (1 point): Let a, b be positive integers. Use a direct proof (and the definitions from the lecture notes) to show that if

Problem 6) (1 point): Let a, b be positive integers. Use a direct proof (and the definitions from the lecture notes) to show that if a is divisible by 6 and b is divisible by 9, then a + b is divisible by 3. [You will lose points if you don't do a direct proof.]

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