Show that the relation R in the set A = {1, 2, 3, 4, 5} given by
R = {(a, b) : |a – b| is even}, is an equivalence relation Show that all the
elements of {1, 3, 5} are related to each other and all the elements of {2, 4} are
related to each other But  no element of {1, 3, 5} is related to any element of {2, 4} 9