Similarly, (a, b) ∈ R and (b, c) ∈ R ⇒ all elements a, b, c, must be
either even or odd simultaneously ⇒ (a, c) ∈ R Hence, R is an equivalence relation Further, all the elements of {1, 3, 5, 7} are related to each other, as all the elements
of this subset are odd Similarly, all the elements of the subset {2, 4, 6} are related to
each other, as all of them are even