Question

Which of the following two sets are equal?

(a) A = {1, 2} and B = {1}

(b) A = {1, 2} and B = {1, 2, 3}

(c) A = {1, 2, 3} and B = {2, 1, 3}

(d) A = {1, 2, 4} and B = {1, 2, 3}

I had been asked this question by my college director while I was bunking the class.

My query is from Sets topic in section Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

Answer 1

The correct answer is (c) A = {1, 2, 3} and B = {2, 1, 3}

The explanation is: Two set are equal if and only if they have the same elements.