## Intermediate Algebra (6th Edition)

$24$
Using $n!=n(n-1)(n-2)\cdot\cdot\cdot(3)(2)(1)$ or the factorial of a number, the given expression, $4! ,$ is equal to \begin{array}{l}\require{cancel} 4(3)(2)(1) \\\\= 12(2)(1) \\\\= 24(1) \\\\= 24 .\end{array}