If in set A={1,2,3,4,5} and R={(a,b):|a-b| is even} it is symmetric but if |1-2|=1 & |2-1|=1 but 1 is not an even how this symmetric explain??
If in set A={1,2,3,4,5} and R={(a,b):|a-b| is even} it is symmetric but if |1-2|=1 & |2-1|=1 but 1 is not an even how this symmetric explain??