# What is 4 factorial ?

Steps to calculate factorial of 4

## How to calculate the factorial of 4

To find 4 factorial, or 4!, simply use the formula that multiplies the number 4 by all positive whole numbers less than it.

Let's look at how to calculate the Factorial of Four :

4! is exactly : 24

Factorial of 4 can be calculated as:
4! = 4 x 3 x 2 x 1

The number of trailing zeros in 4! is 0

The number of digits in 4 factorial is 2.

## What Is Factorial?

A factorial is represented by an integer and an exclamation mark. In math concepts, factorial is a multiplication treatment of natural numbers .

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

Symbolically, it is displayed as "!".

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

## Factorial Formula

To find the factorial of any given number, change the value for n in the given way :

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

The expansion of the formula provides numbers to be replicated collectively to get the factorial of the number.

We can also determine a factorial from the previous one. The factorial of any number is that number replicated the factorial of (that number minus 1).

So the rule is : n! = n × (n−1)!

Example :
4! Factorial = 4 x 3 x 2 x 1 = 4 × 3! = 24

## 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 equal to 1. So, 0! = 1.