Question

Which of the following represents a set of integers greater than zero?

{1, 2, 3, 4, 5}

{1, 2, 3, …, 98, 99, 100}

{all positive numbers}

{1, 2, 3, 4, 5, …}

Answer 1

All of these
all the numbers and each set >0

Answer 2

oops except the 3rd one
those aren't all integers

Answer 3

Yep, except #3, they're all sets of integers greater than zero, or set of all natural numbers \(\mathbb{N}\) in the case of the last one.

Answer 4

#1 and #2 are subsets of #4.