What is 2 factorial ?

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.

• 0 Factorial
• 1 Factorial
• Factorial of 3
• Factorial of 4
• Factorial of 5
• Factorial of 6

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

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

Symbolically, it is listed as "!".

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

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

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

The expansion of the formula gives the numbers to be replicated together with each other to get the factorial of the number.

We can also work out a factorial from the previous 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 :
2! Factorial = 2 x 1 = 2 × 1! = 2

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"

1) Can we have factorials for negative numbers ?
  Negative number factorials are undefined

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

2 in French

2 in English

Factors of 2