Answer:
Step-by-step explanation:
Factorial is used to multiply any natural number with all the numbers smaller than it. It is denoted by n! (n is the natural number)
where n! = n*(n-1)*(n-2)*(n-3)*(n-4) so on....
For example if we take factorial of 5.
Then,
5!= 5*(5-1)*(5-2)*(5-3)*(5-4)
= 5*4*3*2*1
= 120
It is used for the questions which asks us to order a number of things or in how many ways you can arrange something....
