Find integers a and b that do not have a greatest common divisor. Prove that the pair you found are the only pair of integers that do not have a gcd. 1. Let a and b be positive integers. Find the sum...

Find integers a and b that do not have a greatest common divisor. Prove that the pair you found are the only pair of integers that do not have a gcd.

1. Let a and b be positive integers. Find the sum of all the common divisors of a and b. 36.6. Prove that if a and b have a greatest common divisor, it is unique (i.e., they cannot have two greatest common divisor)