Question

If U = {1, 2, 3, 4, 5, 6}, A = {2, 3} and B = {3, 4, 5} then: 

(A) (A ∪ B)’ = {2, 3, 4, 5} 

(B) B – A = {4, 5} 

(C) A – B = {2, 4, 5} 

(D) (A ∪ B) = {3}

Answer 1

Answer is (B)

B – A means B contains the element which is not present in A. 

Thus, B – A = {4, 5}