FACTDOUBLE Google Sheet Formula
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FACTDOUBLE Formula Syntax
Example Use Case
Calculating the double factorial for specialized combinatorial problems
Understanding the FACTDOUBLE Formula
The FACTDOUBLE function in Excel computes the double factorial of a number, multiplying every other integer down from it (e.g., 7 × 5 × 3 × 1 for odd, 6 × 4 × 2 for even). It’s a niche combinatorial tool, less common than FACT, but useful in specific math or physics contexts.
For 7, it returns 105 (7 × 5 × 3 × 1). Unlike FACT, it skips every second number, offering a unique twist for problems like quantum mechanics or graph theory where double factorials appear.
Why Use FACTDOUBLE?
FACTDOUBLE serves advanced users needing double factorial results—think specialized probability or series expansions. It’s a time-saver for rare but precise applications, automating a stepped factorial process.
Example with Sample Data
| Number | Formula | Result |
|---|---|---|
| 7 | =FACTDOUBLE(7) | 105 |
| 4 | =FACTDOUBLE(4) | 8 |
| 5 | =FACTDOUBLE(5) | 15 |
FACTDOUBLE steps down: 7 gives 105 (7×5×3×1), 4 gives 8 (4×2). It’s a double-dose factorial.
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