Let U = {1,2,3,4,5,6,7,8,9}, A = {1,2,3,4}, B = {2,4,6,8} and C = {3,4,5,6}. Find :
(i) A′ (ii) B′ (iii) (A∩C)′
(iv) (A∪B)′ (v) (A′)′ (vi) (B−C)′