Fractions and Binomials[edit]
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A fraction is created using the \frac{numerator}{denominator} command.
(for those who need their memories refreshed, that's the top and bottom respectively!). Likewise, the binomial coefficient (aka the Choose function) may be written using the \binom command
\frac{n!}{k!(n-k)!} = \binom{n}{k}
{\displaystyle {\frac {n!}{k!(n-k)!}}={\binom {n}{k}}} {\frac {n!}{k!(n-k)!}}={\binom {n}{k}}