Which set is the subset of all sets
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.