Set:
A set is a collection of well defined objects. We write sets either in the Roster form or in the set builder form.

Roster Form:
This method is also known as tabular method. In this method, a set is represented by listing all the elements of the set, the elements being separated by commas and are enclosed within flower brackets { }.

Example:
A is a set of natural numbers which are less than 6. Solution:
A = {1,2,3,4,5} is the Roster form.

Directions: Write the given sets in Roster form. Also write at least ten examples of your own.