Question

The union of the sets {1, 2, 5} and {1, 2, 6} is the set _______________

(a) {1, 2, 6, 1}

(b) {1, 2, 5, 6}

(c) {1, 2, 1, 2}

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

I got this question at a job interview.

This is a very interesting question from Set Operations in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

Answer 1

Correct answer is (b) {1, 2, 5, 6}

To explain: The union of the sets A and B, is the set that contains those elements that are either in A or in B.