Question

Convert set {x: x is a positive prime number which divides 72} in roster form.

(a) {2, 3, 5}

(b) {2, 3, 6}

(c) {2, 3}

(d) {∅}

I had been asked this question during an online exam.

Question is taken from Types of Set in section Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

Answer 1

Correct option is (c) {2, 3}

To explain I would say: 2 and 3 are the  divisors of 72 which are prime.