Question

what are co-primes write all the pairs of co-primes are co-primes always primes if no ,illustrate your answer by an example
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Answer 1

⇒ Two integers a and b are said to be relatively prime, mutually prime, or coprime (also written co-prime) if the only positive integer (factor) that divides both of them is 1. ... A set of integers can also be called coprime

⇒ Pairs of co-prime are: 2,3;3,4;4,5;5,6;6,7

⇒ No, 15,16 are co-prime but none of them is prime.