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# Factorial of 1 is 1 | What is a factorial of 1 ? ## How to calculate the factorial of 1

1! is exactly: 1

The number of trailing zeros in 1! is 0.

The number of digits in 1 factorial is 1.

The factorial of 1 is 1 calculated, through its definition, this way:

1 X

### What is factorial of 1?

Definition of factorial of 1

The factorial is a basically a quantity which is defined for integer value 1 which is greater than or equal to 0.

The factorial is nothing but the product of all intergers which is less than or equal to n but it is greater than or equal to 1. By definition we can say that the factorial value of 0 is equal to 1. We can not have negative integers factorial as defined. We can see that factorial is the result of multiplying a sequence of descending natural numbers. We can say that factorial of 1 is calculated as 1 X

### Factorial Formula for 1 For 1 is natural number which is greater than or equal to 1. Then we can have the formula as

1! = 1 x (1-1) ..... 1 X

#### Simalar Questions asked in exam for factorial of 1 :-

• Check How many digits are there in 1 factorial?
• What is the factorial of 1?
• How many trailing zeros are in 1 factorial?
• What is the last digits of factorial of 1?

## Table for factorial of 1 to 1

# Factorial of Factorial is
1 1 1

### Factorial examples

Example 1:-

What is the factorial of 2?

Solution :-

We know that factorial formula for 2 is
2! = 2 × (2-1) X (2-2) ..... 2 X 1

So the factorial of 2 is

2! = 2 X (2-1) X (2-2)

2! = 2 X 1

2! = 2

Example 2:-

What is the factorial of 3?

Solution :-

We know that factorial formula for 2 is
3! = 3 × (3-1) X (3-2) X (3-3) ..... 3 X 2 X 1

So the factorial of 3 is

3! = 3 X (3-1) X (3-2) X (3-3)

3! = 3 X 2 X 1

3! = 6

Example 3:-

What is the factorial of 4?

Solution :-

We know that factorial formula for 4 is
4! = 4 × (4-1) X (4-2) X (4-3) X (4-4) ..... 4 X 3 X 2 X 1

So the factorial of 4 is

4! = 4 X (4-1) X (4-2) X (4-3) X (4-4)

4! = 4 X 3 X 2 X 1

4! = 24

## Frequently Asked Questions(FAQ) for Factorial

##### What is the factorial of 1?
The factorial of 1 is 1
##### Check How many digits are there in 1 factorial?

The number of number of digits in 1 factorial is 1.

##### What is the meaning of 1 factorial?
The meaning of 1 factorial is a quantity which is defined for integer value 1 which is greater than or equal to 0.
##### What is the symbol of factorial?

The symbol for factorial is ! (exclamation mark).

##### What is the factorial of 0?

The value of factorial of 0 is 1, i.e. 0! = 1.

##### What is the factorial of 0?

The value of factorial of 0 is 1.

##### What is the factorial of 4?

The value of factorial of 4 is 24.

##### What is the factorial of 3?

The value of factorial of 3 is 6.