**Common questions about the FACTDOUBLE formula include:**

- What is the FACTDOUBLE formula?

- How does the FACTDOUBLE formula work?

- What does the FACTDOUBLE formula do?

The FACTDOUBLE formula can be

**used to calculate the double factorial of a number**. This formula can be used appropriately by entering a number (positive, negative, or zero) into the formula, and letting the worksheet calculate the double factorial.

The FACTDOUBLE formula is

**commonly mistyped**by users as "FACTOIDDOUBLE," which is an invalid formula that will return an error. It can also be mistyped as FACTDOUBEL, FACTDUBLE, FACTDOUBL, FACTDUOBLE.

**Common ways the FACTDOUBLE formula is used inappropriately**include using the formula on non-numeric values, such as text, or on non-integer values (such as fractions or decimals).

**Common pitfalls**when using the FACTDOUBLE formula include attempting to use it on numbers that are too large for the worksheet to process, or assuming that the formula will calculate the factorial of a number, as opposed to a double-factorial.

**Common mistakes**when using the FACTDOUBLE formula include accidentally entering an incorrect formula, such as "FACTOIDDOUBLE," instead of the correct formula, or accidentally entering non-numeric values in the formula.

**Common misconceptions**people may have with the FACTDOUBLE formula are to assume that it calculates the factorial of a number, as opposed to a double-factorial. Additionally, some people may mistakenly think that the FACTDOUBLE formula cannot be used on negative numbers, when in fact it can.