The factorial of a number n written n! is the product of n along with all the natural numbers smaller than n (not including zero !!!).

Therefore, n! = n x (n - 1) x (n - 2) ... 3 x 2 x 1

For example, 5! = 5 x 4 x 3 x 2 x 1 = 120

Here are some facts about the factorial:

See the Gamma Function


Enrichment task



Last change to this page
Full Page history
Links to this page
Edit this page
  (with sufficient authority)
Change password
Recent changes
All pages
Search