Any set of prime numbers has a GCF of 1, which is the technical definition of being relatively prime but it's a bit redundant. The members of that set are already prime.
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A single number cannot be relatively prime. Any pair of numbers between 50 and 100 of which one is a prime will be relatively prime. There are 728 pairs of numbers that are relatively prime and I have neither the time nor patience to list them all!
86 and 154 are not relatively prime because they are both even numbers. Relatively prime numbers have no common factors other than 1, and all even numbers have 2 as a common factor.
All of them. Any number greater than one can be relatively prime.
You might be thinking of relatively prime numbers. Two numbers are considered relatively prime if their GCF is 1. 4 and 9 are relatively prime.
It can be. Since 13 is a prime number, it is relatively prime to all other numbers except for multiples of 13.