alleryWhich pair has no common positive factor other than 1?
A14 and 21
B15 and 25
C14 and 25
D21 and 35
Answer & Solution
Correct answer: C. 14 and 25
14 = 2 × 7 and 25 = 5 × 5 share no prime factor, so their HCF is 1.
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