Question

Which of the following is a pair of co-prime numbers? A) 18, 20 B) 99, 100 C) 7, 91 D) 17, 34

Answer 1

99,100 are pair of co-prime number

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Answer 2

A Co-prime number is a set of numbers or integers which have only 1 as their common factor i.e. their highest common factor (HCF) will be 1.

A) both are divisible by 2 so not a coprime

B) yes ,only one is there common factor so coprimes

C) both are divisible by 7 so not a coprime

D)both are divisible by 17 so not a coprime