Which of the following numbers are co-prime? (a) 18 and 35
(a) 18 and 35 Factors of 18 are 1, 2, 3, 6, 9, 18 Factors of 35 are 1, 5, 7, 35 Common factor = 1 Since, their common factor is 1. Hence, the given two numbers are co-prime
