Factorial of a Number Calculator
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Factorial of a Number
Factorial of a number n can be defined as product of all positive numbers less than or equal to n. For example, the factorial of 6 is 1 × 2 × 3 × 4 × 5 × 6 = 720
Examples
The following table provides few examples of factorial of a number.
| Number | Factorial | Result |
|---|---|---|
| 1! | 1 | 1 |
| 2! | 1 × 2 | 2 |
| 3! | 1 × 2 × 3 | 6 |
| 4! | 1 × 2 × 3 × 4 | 24 |
Note: In Mathematics, factorial of a number is represented by exclamation mark.
Calculator
The following calculator will help you to find the factorial of any given number.
Why does 0! = 1?
We Know That
| Number | Factorial | Result |
|---|---|---|
| 4! | 1 × 2 × 3 × 4 | 24 |
| 3! | 1 × 2 × 3 | 6 |
| 2! | 1 × 2 | 2 |
| 1! | 1 | 1 |
Now turn this around
| Number | Calculation | Result |
|---|---|---|
| 4! | 5! / 5 | 24 |
| 3! | 4! / 4 | 6 |
| 2! | 3! / 3 | 2 |
| 1! | 2! / 2 | 1 |
| 0! | 1! / 1 | 1 |
In this way a reasonable value for 0! can be found.
Useful links
C Program to find Factorial of a Number
C++ Program to find Factorial of a Number
C# Program to find Factorial of a Number
Java Program to find Factorial of a Number
PHP Program to find Factorial of a Number
Python Program to find Factorial of a Number
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