# What is 80 factorial ?

Steps to calculate factorial of 80

## How to calculate the factorial of 80

To find 80 factorial, or 80!, simply use the formula that multiplies the number 80 by all positive whole numbers less than it.

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

80! is exactly : 71569457046263802294811533723186532165584657342365752577109445058227039255480148842668944867280814080000000000000000000

Factorial of 80 can be calculated as:
80! = 80 x 79 x 78 x 77 x ... x 3 x 2 x 1

The number of trailing zeros in 80! is 19

The number of digits in 80 factorial is 119.

## What Is Factorial?

A factorial is represented by an integer and an exclamation tag. 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 showed as "!".

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

## Factorial Formula

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

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

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

We can also measure a factorial from the prior 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 :
80! Factorial = 80 x 79 x 78 x 77 x ... x 3 x 2 x 1 = 80 × 79! = 71569457046263802294811533723186532165584657342365752577109445058227039255480148842668944867280814080000000000000000000

## 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.