Variations without repetition

Find out how many different ways you can choose k items from n items set. With/without repetition, with/without order.

(n)
(k)

Calculation:

V_k(n) =  frac{n!}{(n - k)!} $    $ V_{ 3} (11) =  frac{ 11!}{( 11 - 3)!} =  frac{ 11!}{ 8!}  = 11  * 10  * 9 = 990 $    $

Number of variations: 990