FACTDOUBLE
The FACTDOUBLE function in Google Sheets returns the "double factorial" of a number.
Function Syntax and Parameters
Syntax: FACTDOUBLE(value)
Parameters:
value: The number for which you want to calculate the double factorial.
Step-by-Step Tutorial
- Calculating double factorial:
- Example: 
=FACTDOUBLE(5) - Result: 
15 
 - Example: 
 
Use Cases and Scenarios
- Combinatorics: Calculate the number of possible permutations in a given situation.
 - Probability: Determine the number of ways events can occur in a particular experiment.
 - Mathematical Modeling: Solve problems involving permutations and combinations.
 
Related Functions
FACT: Returns the factorial of a number.