Question

Let U = {1, 2, 3, 4, 5, 6}, A = {1,4} and B = {2,3,5}. Find B’.

(a) {2,3,5,6}

(b) {1,2,3}

(c) {1,4,6}

(d) {1,2,3,4,5,6}

I have been asked this question during an online exam.

Question is taken from Complement of a Set topic in division Sets of Mathematics – Class 11

Answer 1

Right choice is (c) {1,4,6}

To explain: Complement of a set A is a set which contains elements of U which are not the elements of B. So, B’ = U – B = {1, 2, 3, 4, 5, 6} – {2,3,5} = {1,4,6}.