Question

Which sets are not empty?

(a) {x: x is a even prime greater than 3}

(b) {x : x is a multiple of 2 and is odd}

(c) {x: x is an even number and x+3 is even}

(d) { x: x is a prime number less than 5 and is odd}

This question was addressed to me in my homework.

Origin of the question is Set Operations topic in section Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

Answer 1

Correct answer is (d) { x: x is a prime number less than 5 and is odd}

The best explanation: Because the set is {3}.