7 Show that the relation R in the set A of all the books in a library of a college,
given by R = {(x, y) : x and y have same number of pages} is an equivalence
relation 8 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