सब प्रश्न 1. If U = {x : 1 ≤ x < 10, x ∈ N}, A = {1, 2, 5, 7, 9}, B = {3, 4, 5, 7, 10} and C = {2, 5, 7, 10}, (a) Show the given sets in a Venn diagram. [1] (b) What is the cardinality of the universal set U? [1] [Ans: n(U) = 10] (c) Prove this relation A - (BC) = (AUB) - (BC).[3] What is the relation between A - Band B - A?​