Question

The difference of {1, 2, 3} and {1, 2, 5} is the set ____________

(a) {1}

(b) {5}

(c) {3}

(d) {2}

This question was posed to me during an interview.

I'd like to ask this question from Set Operations in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

Answer 1

Correct choice is (c) {3}

For explanation I would say: The difference of the sets A and B denoted by A-B, is the set containing those elements that are in A not in B.