Question

Which of the following is not a subset of {1, 2, 3}?

{0}
{1, 2, 3}
Ø

Answer 1

{0}

Explanation:

{0} is not because 0 is not an element of set {1, 2, 3}

The null set is a subset of every set, so Ø is.

A set is a subset of itself.