alleryStart learning →Which group contains only prime numbers?
A2, 4, 5, 7
B2, 3, 5, 7
C3, 5, 9, 11
D5, 7, 11, 15
Answer & Solution
Correct answer: B. 2, 3, 5, 7
2, 3, 5 and 7 each have exactly two factors, 1 and itself, so all are prime.
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