If set A has p no. of elements and set B has q number of elements then the total number of relations defined from set A to set B is 2pq.
Dec 10, 2021, 16:45 IST
If set A has p no. of elements and set B has q number of elements then the total numberof relations defined from set A to set B is 2pq.
Definition :-For any set A such that n(A) = n
Then number of all relations on A is
As the total number of relations that can be defined a set A to B is the number of possible subsets of A ×B. If n(A) = p and n(B) = q then n(A × B) = pq and the number of subsets of
Example 1 :-If set 
and set B =
find the number of relations defined from set A to B.
Solution :-
Set A has 2 elements and set B has 3 elements then the no. of relation defined from A to B is 
Example 2 :-The number of relations defined on set A = {a,b,c,d}.
Solution :-
Set A has 4 elements
No. of relation defined on set A is 
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