Write down all possible proper subsets each of the following sets :
(i) {1, 2} (ii) {1, 2, 3}
(iii) {1}
Write down all possible subsets of A={1,{2,3}}.
Write down all possible subsets of each of the following sets :
(i) {a} (ii) {0, 1}
(iii) {a, b, c}