What is a co-prime number?

1 Answer
Apr 6, 2016

Answer:

Numbers, which do not have any common factor between them other than one, are called co-prime numbers.

Explanation:

When two numbers (they may not be prime) do not have any common factor other than one between them they are called co-prime or relatively prime.

It is obvious that two prime numbers are always co-prime. For example, #17# and #23#.

However, even two composite numbers can also be co-prime or relatively prime. For example #16# and #25# do not have any common factor other than one. Similarly #84# and #65# do not have any common factor and are hence co-prime.