There are two types of representation:
 Tabular form
 Set – builder form
Tabular or roster form: A set is described by listing elements, separated by commas, in { } brackets.
Example:
 The set of five prime numbers can be described as {2, 3, 5, 7, 11}
 The set of all months having 31 days described as {January, March, May, July, August, October, December}
Set – builder form: A set is described by property of all the elements within brackets.
Example:
A = {x : x is a natural number and less than 5}
B = { x : x is a vowel of English Alphabet}
Roster form 
Set – builder form 

(1)  
(2)  
(3)  
(4)  
(5)  
(6) 