the types of sets

Set: A collection of well define objects or numbers. It is written within curly brasses {}.
Ex:
A={blue, red, yellow, green}. [Here set A is the collection of color.]
B={a, b, c, d, e}. [Here set B has collection of alphabets.]
A={2,4,6,8}. [Here set A has collection of even numbers.]
A={-3,-2,3,5,8} [Here set A has collection of integer numbers.]
There are two methods to write sets.
1. Roster Method.
2. Set-builder Method.
Types of sets:
1. Empty or Null set: A set is said to be empty set...