alleryStart learning →Which pair of numbers is coprime?
A14 and 21
B16 and 36
C15 and 28
D27 and 45
Answer & Solution
Correct answer: C. 15 and 28
15 and 28 share no factor other than 1. The pairs 14 and 21, 16 and 36, 27 and 45 have common factors 7, 4 and 9.
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