52 and 55
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No. The concept of prime is defined only for natural numbers greater than 1.
All of them. Any number greater than one can be relatively prime.
Numbers called relatively prime or mutually prime have no common factors or divisors other than 1. Numbers having any common factors or divisors greater than 1 are not relatively or mutually prime.
Yes.
39 and 45 are not relatively prime because they have 3 as a common factor. Relatively prime numbers have no common factor greater than 1.