The expression $n!$ (read "n factorial") is the product of the integer $n (n > 0)$, times one less than $n$, times two less than $n$, etc., times 1. In other words:

$$ n!=n(n-1)(n-2)(n-3)...(3)(2)(1) $$

Which of the following is equivalent to:

$$ \frac { n! }{ (n-2)! } $$

Select an assignment template