Question

n(a)=4 and n(b)=8 then total number of one one functions from A to B​

Answer 1

Step-by-step explanation:

120

n(A)=4 and n(B)=5

For one-one mapping

4 elements can be selected out of 5 elements of set B in

5

C

4

ways

and then those 4 selected elements can be mapped with 4 elements of set A in 4! ways.

Number of one-one mapping from A to B =

5

C

4

×4!=

5

P

4

=

(5−4)!

5!

=5!=120