Durgadhanalakshmi..., Here set A contains three elements {1,2,3} & B {3,4} & C {4,5,6} Now (A X B) states that the total elements by combining together A and B which is equal to {1,2,3,4} similarly (B X C) = {3,4,5,6} now. intersection states that the common elements in (A X B) & (B X C) Which is the answer {3,4}