1.

If set A = {1,2,3,4} and B = {3,4,5,6}. Find B-A.(a) {1,2,3,4,5,6}(b) {3,4}(c) {1,2}(d) {5,6}I have been asked this question in an internship interview.This intriguing question originated from Operation on Sets-2 in portion Sets of Mathematics – Class 11

Answer»

The correct CHOICE is (d) {5,6}

For EXPLANATION I WOULD say: B-A is the set of ELEMENTS that BELONGS to B but not to A. Here, 5 and 6 belongs to B but not to A. So,

A = {1,2,3,4}

B = {3,4,5,6}

B-A = {3,4,5,6} – {1,2,3,4} = {5,6}.


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