Let R = {(x, x2) : x is a prime number less than 10}.
(i) Write R in roster form.
(ii)Find dom (R) and range (R).

Answer : i) {(x, x2) : x is a prime number less than 10}. Roster form: R = {(1, 1), (2, 4), (3, 9), (5, 25), (7, 49)}

(ii) The domain of R is the set of first co-ordinates of R Dom(R) = {1, 2, 3, 5, 7}

The range of R is the set of second co-ordinates of R Range(R) = {1, 4, 9, 25, 49}