Question: Problem 5.9. Let n be an integer. Prove that if n is divisible by 3, then n is divisible by 3. Problem 5.10. Show

Problem 5.9. Let n be an integer. Prove that if n is

Problem 5.9. Let n be an integer. Prove that if n is divisible by 3, then n is divisible by 3. Problem 5.10. Show that 3 is not rational. (You may want to use the result of Problem 5.9 to work this problem.)

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