FACT is a function in Google Sheets that returns the factorial of a given value. The factorial of a number is the product of all positive integers up to and including that number.

For example, the factorial of 5 is 5 x 4 x 3 x 2 x 1, which equals 120.

The FACT function takes one argument, which is the value for which you want to calculate the factorial. The value must be a non-negative integer.

Here's an example:

Let's say you want to find the factorial of 7. To use the FACT function in Google Sheets, you would write:

=FACT(7)

This function will return the factorial of 7, which is 5040.