# Permutation
# Colorized Definition
\newcommand{\order}{\color{c1}}
\newcommand{\total}{\color{c2}}
\newcommand{\stopCount}{\color{c3}}
\newcommand{\partOne}{\color{c4}}
\newcommand{\combo}{\color{c5}}
$$\order P(\total n,\partOne k \order ) \plain = \stopCount \frac{\total n!}{\stopCount (n - \partOne k \stopCount ) ! }$$
\order To order (permute)
\partOne k
\order items from
\total n
\order choices,
\\
\total start counting all orderings
\plain and
\\
\stopCount stop counting after
\partOne k
\stopCount items are found