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OpenStudy (gigi1103):
medal medal Cynthia made the conjecture that the sum of any prime number and any composite number is a composite number. Which equation is a counterexample to her conjecture? A. 11 + 2 = 13 B. 11 + 9 = 20 C. 13 + 2 = 15 D. 5 + 8 = 13
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