# Combination
# Colorized Definition
\newcommand{\order}{\color{c1}}
\newcommand{\total}{\color{c2}}
\newcommand{\stopCount}{\color{c3}}
\newcommand{\partOne}{\color{c4}}
\newcommand{\combo}{\color{c5}}
$$\combo C(\total n, \partOne k \combo ) = \stopCount \frac{ \order P(n,k)}{ \stopCount k!} $$
\combo To group (combine) \partOne k \combo items from \total n \combo choices,
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\order count the specific permutations
\plain and
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\stopCount consolidate the reorderings within the group