SOLUTION: Relation R on the set of positive integers is defined by the rule that aRb means gcd(a, b) = 1. Is R reflexive? Symmetric? Transitive?

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Question 1030237: Relation R on the set of positive integers is defined by the rule that aRb means gcd(a, b) = 1. Is R reflexive? Symmetric? Transitive?

Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
R is symmetric, as aRb = bRa = 1. (Obviously.)
R is not reflexive, as 3R3 = 3.
R is not transitive, as 3R7 = 1 and 7R15 = 1, but 3R15 = 3.