The number of proper subsets of the set {1, 2, 3} is ___.
Write down all possible proper subsets each of the following sets :
(i) {1, 2} (ii) {1, 2, 3}
(iii) {1}
The number of proper subsets of the set A = {1, 2, 3} is ___.
Write down all possible subsets of A={1,{2,3}}.
