Question

Define co-prime numbers.

Answer 1

Co-prime numbers : Two numbers which have only 1 as a common factor are said to be coprime or relatively prime or mutually prime numbers.

For example 10 and 21 are co-primes, because the divisors of 10 are 1, 2, 5, 10 while the divisors of 21 are 1, 3, 7, 21 and the only factor common to both 10 and 21 is 1. Some other co-prime numbers are (3, 8); (4, 9); (21, 22); (22,23); (23,24).