Which of the following numbers are co-prime? (e) 216 and 215
216 and 215 Factors of 216 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 27, 36, 54, 72, 108, 216 Factors of 215 are 1, 5, 43, 215 Common factors = 1 Since, their common factor is 1. Hence, the given two numbers are co-prime
