Define a binary relation R on {n ∈ Z: ≥ 2} such that aRb if and only if a and b havea common factor not equal to 1.

Show R is reflexive and symmetric but not an equivalencerelation.

hmm so n ∈ Z: ≥ 2

and a and b does not have a common factor of 1.

so if we make a all even squares ≥ 2 and b, all squares powers..from 1 upwards

{1,2,3}

we use a subset we could have would be all Z ≥ 2 a ={2,4,8} b ={1,2,3}

Is this on the right track

any help would be appreciated thanks