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What is coprime number ?
When two numbers have no common factors other than 1 then they are called co-prime or relatively prime.
For example 21 and 22 are co-prime:
• The factors of 21 are 1, 3, 7 and 21
• The factors of 22 are 1, 2, 11 and 22
They have no common factor other than 1. So they are co-prime
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