(Attempt all the questions.)
1If set A = {n, u, m, b, e, r} and B = {m, a, 1, h} are the two subsets of set U = {n, u. m. b. e, r, a, 1, h) then,
(a) (Define improper subset.)
(b) Write down one proper and one improper subset of A.
c. (Represent the sets A and B in the Venn-diagram.) ​