Question

Use the listing method to write the following set.

x

{1, 2, 3}
{0, 1, 2, 3}
{1, 2}

Answer 1

{1, 2}

Explanation:

Hello there!

The following set

x

means: all x given that x is a natural number and x is less than 3.

Natural numbers are: 1, 2, 3, 4, 5, et cetera. 3 is not less than 3, so the list is: {1, 2}

Answer 2

Listing method is a method of listing elements in which all the elements are listed and each element is separated comma. The whole set is enclosed with curly braces.
The set x N, x < 3 means that it contains elements that are real numbers smaller than 3.
The elements that are in this set are: {1,2}