The exact factorial of 1 is:
📌 Number of digits in the exact factorial of 1! = 1.
Approximately, the value of 1! can also be written as 1.
How to calculate 1!
The formula for finding the factorial of a number is:
n! = n × (n-1) × (n-2) × … × 2 × 1
The same formula can also be written in terms of PI product notation as:
So, by definition, 1! is calculated as:
Frequently asked questions
Here are some frequently asked questions about factorial of 1:
How many digits are there in the exact value of 1!?
There are 1 digits in the exact value of 1!.
What is the value of 1 factorial in terms of E?
The value of 1! in terms of E is 1.
What are the uses of factorials?
According to Wikipedia:
In mathematical analysis, factorials are used in power series for the exponential function and other functions, and they also have applications in algebra, number theory, probability theory, and computer science.