Question

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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

Answer 1

A composite number is a positive integer that has at least one positive divisor other than one or the number itself. In other words, a composite number is any positive integer greater than one that is not a prime number


5 is prime
8 is composite
13 is prime ... therefore D

Answer 2

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