Question

Which of the following is a pair of co-primes ?

(a) (14, 35) (b) (18, 25) (c) (31, 93) (d) (32, 62)

Answer 1

HCF of co-prime numbers should be 1. (There should be no other common factor except 1)

14 and 35 have 7 as their common factor.

31 and 93 have 31 as their common factor.

32 and 62 have 2 as their common factor.

18 and 25 have 1 as their common factor.

Hence, pair of co-primes numbers is (18,25)