Factorial/Examples/6

Example of Factorial

$6! = 720$


Proof

\(\ds 6!\) \(=\) \(\ds 6 \times 5!\) Definition 1 of Factorial
\(\ds \) \(=\) \(\ds 6 \times 120\) Factorial of $5$
\(\ds \) \(=\) \(\ds 720\)

$\blacksquare$


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 $n$
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