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2019 AMC 10BProblem 2P1-10~1 minPrint
Logic PuzzlesPrimesUse the answer choices (mod checks, size, form) to eliminate or selectTest small/specific values or special cases to find or verify the answer

Consider the statement, "If nn is not prime, then n−2n-2 is prime." Which of the following values of nn is a counterexample to this statement?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.