Write down all possible proper subsets each of the following sets :
(i) {1, 2} (ii) {1, 2, 3}
(iii) {1}
Write down all the subsets of the following sets:
(i) {a}
(ii) {a, b}
(iii) {1, 2, 3}
(iv) Φ
Write down all possible subsets of each of the following sets :
(i) {a} (ii) {0, 1}
(iii) {a, b, c} (iv) {1, {1}}
(v) {ϕ}