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Which of the following is a pair of co-primes

This question belongs to Arithmetic Ability Problems On H.C.F And L.C.M
Problems on H.C.F and L.C.M
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Which of the following is a pair of co-primes ?

Answer & Solution
Correct Answer: Option B
H.C.F. of 18 and 25 is 1
So, they are co-primes
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