(i) {1,2,3,6} (a) { x : x is a prime number and a divisor of 6 }
(ii) {2, 3} (b) { x : x is an odd natural number less than 10 }
(iii) {M,A,T,H,E,I,C,S} (c) {x : x is natural number and divisor of 6}
(iv) {1, 3, 5, 7, 9} (d) {x : x is a letter of the word MATHEMATICS}