Q1:Let U = {1, 2, 3, 4, 5}, C = {1, 3}
and A and B are non empty sets. Find A in each of the following:
(i) A ∪ B = U, A ∩ B = φ and B = {1}
(ii) A ⊂ B and A ∪ B = {4, 5}
(iii) A ∩ B = {3}, A ∪ B = {2, 3, 4} and B ∪ C = {1,2,3}
(iv) A and B are disjoint, B and C are disjoint, and the union of A and B is the set {1, 2}.