# What is 25 factorial ?

Steps to calculate factorial of 25

## How to calculate the factorial of 25

To find 25 factorial, or 25!, simply use the formula that multiplies the number 25 by all positive whole numbers less than it.

Let's look at how to calculate the Factorial of Twenty-five :

25! is exactly : 15511210043330985984000000

Factorial of 25 can be calculated as:
25! = 25 x 24 x 23 x 22 x ... x 3 x 2 x 1

The number of trailing zeros in 25! is 6

The number of digits in 25 factorial is 26.

## What Is Factorial?

A factorial is displayed by an integer and an exclamation symbol. In Mathematics, factorial is a multiplication function of natural numbers .

It multiplies the number by every noreal number that is less than it .

Symbolically, it is showed as "!".

The function is used, among other things, to find the "n" way things can be organized .

## Factorial Formula

To find the factorial of any given number, substitute the value for n in the given formulation :

n! = n × (n-1) × (n-2) × (n-3) × ….× 3 × 2 × 1

The expansion of the formula provides numbers to be replicated to each other to receive the factorial of the number.

We can also figure out a factorial from the prior one. The factorial of any number is that number multiplied the factorial of (that number minus 1).

So the rule is : n! = n × (n−1)!

Example :
25! Factorial = 25 x 24 x 23 x 22 x ... x 3 x 2 x 1 = 25 × 24! = 15511210043330985984000000

## What are Factorials Used For?

The best use of factorial is in Combinations and Permutations.

Example : Determine how to arrange letters without repeating?

There one way for 1 letter "a":
2 ways for two letters "ab": ab, ba.
There are 6 ways for 3 letters "abc": abc acb cab bac bca.
There are 24 ways for 1234 of the letters "abcd"

## Frequently Asked Questions on Factorial

### Can we have factorials for negative numbers ?

Negative number factorials are undefined

### What Is 0!

Zero factorial or Factorial of 0 is simple, and its own value is corresponding to 1. So, 0! = 1.