# What is 2 factorial ?

Steps to calculate factorial of 2

## How to calculate the factorial of 2

To find 2 factorial, or 2!, simply use the formula that multiplies the number 2 by all positive whole numbers less than it.

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

2! is exactly : 2

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

The number of trailing zeros in 2! is 0

The number of digits in 2 factorial is 1.

## What Is Factorial?

A factorial is represented by an integer and an exclamation mark. In Mathematics, factorial is a multiplication procedure of natural numbers .

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

Symbolically, it is represented as "!".

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

## Factorial Formula

To find the factorial of any given number, alternate the value for n in the given method :

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

The expansion of the formula shows the numbers to be replicated at the same time to receive the factorial of the number.

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

So the rule is : n! = n × (n−1)!

Example :
2! Factorial = 2 x 1 = 2 × 1! = 2

## 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 value is corresponding to 1. So, 0! = 1.