Question

How can we denote null set .
This letter taken from _______
alphabet

Answer 1

Null set :- A set which has no elements is known as empty set or null set .
it is denoted by ø ( phi ) or { }.
phi ( ø) is taken from Greek alphabet.

Answer 2

Null set is set in which no elements are present and null set is denoted by ∅(phi)
Example: set A ={1,3,5,7} ,set B={2,4,6,8}
                 A∩B=∅ as no common elements are present in A and B.