Factorial/Examples/4

Example of Factorial

$4! = 24$

Proof

\(\ds 4!\)

\(=\)

\(\ds 4 \times 3 \times 2 \times 1\)

Definition of Factorial

\(\ds \)

\(=\)

\(\ds 24\)

$\blacksquare$

Sources

• 2009: Murray R. Spiegel, Seymour Lipschutz and John Liu: Mathematical Handbook of Formulas and Tables (3rd ed.) ... (previous) ... (next): $\S 3$: The Binomial Formula and Binomial Coefficients: Factorial $n$