FACTDOUBLE
The FACTDOUBLE function returns the double factorial of a number. It computes the product of every second number up to the given number. Use it to calculate double factorials efficiently in Excel.
Syntax 🔗
=FACTDOUBLE(number)
number | The number for which you want to calculate the double factorial. |
About FACTDOUBLE 🔗
Use the FACTDOUBLE function in Excel to calculate the double factorial of a number. This function finds the product of every second number up to a specified value. It's helpful for permutation problems or combinatorial calculations where a double factorial is needed.
Examples 🔗
For example, if you want to find the double factorial of 8, you would use the formula: =FACTDOUBLE(8). This will return 3840, which is the product of every second number starting from 8 down to 1 (8*6*4*2).
Another example is calculating the double factorial of 5 using the formula: =FACTDOUBLE(5). This will give you 15 (5*3*1).
Notes 🔗
Use the FACTDOUBLE function when working with problems involving arrangements or combinations where the double factorial is applicable. Ensure you provide a valid numerical input to receive accurate results.
Questions 🔗
The double factorial is commonly used in combinatorial mathematics, particularly when dealing with permutations and arrangements. It helps efficiently calculate the product of every second number up to a given value, providing a specialized tool for specific mathematical computations.
Can I use negative numbers or non-integer values with the FACTDOUBLE function?No, the FACTDOUBLE function works with positive integers only. It is designed to calculate the double factorial of whole numbers, starting from the provided input number and descending by twos until reaching 1.
How does the FACTDOUBLE function differ from the FACT function in Excel?The FACT function calculates the factorial of a number by multiplying all positive integers up to that number, while the FACTDOUBLE function specifically computes the double factorial by multiplying every second number up to the specified value. The distinction lies in the pattern of multiplication followed by each function.