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Discovery Problems 10. Threepeat /Thirteen [15 points] A threepeat is a positive integer that has exactly six digits, and where the first three digits are the same as the last three digits. For example, 203203 is a threepeat. Which threepeats are divisible by 13? Is it all of them? None of them? Only the even ones? Only those that are large enough? Something else? Choose one of the following three propositions, and then give a proof of the proposition you choose: . All threepeats are divisible by 13. . No threepeats are divisible by 13. . Some threepeats are divisible by 13, and others are not. A threepeat t is divisible by 13 if and only if (if you choose this option, fill in the blank to complete a proposition)