Question

The number of bijection functions that can be defined from set $A$ to set $B$ is $24,$ then $n\left(A\right)+n\left(B\right)$ is

Answer 1

Since, it is a bijection function
$\therefore n\left(A\right)=n\left(B\right)=n$
We know that the number of bijection function$=n!$
$\Rightarrow n!=24\Rightarrow n=4\therefore n\left(A\right)+n\left(B\right)=2n=8$