Mathematics, 19.07.2019 08:40 sammiehammer

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. 13 + 2 = 15 b. 11 + 9 = 20 c. 5 + 8 = 13 d. 11 + 2 = 13

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