# Math/fractions

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## Binomial coefficients

To write binomial coefficients you use any of `\binom`, `\tbinom` or `\dbinom` (the latter two if you want to force text style or display style respectively). These commands are defined as fractions in ConTeXt, and can be set up with
`\setupmathfractions`.

The default look of the binomial coefficients look good in several fonts, but for example not perfect in Latin Modern. You can play with `\setupmathfractions`, and in particular, you can try

\setupmathfractions[binomial][ fences=parenthesis, %threshold=1.5, ]

Below we show some of the often used fonts, together with the default setting and the one just suggested. You can also play with the threshold key.

\setuphead[chapter][align=middle] \setuphead[section][style=\bfa] \setuphead[subsection][style=\it] \setuplayout[ topspace=1in, bottomspace=1in, header=0pt, footer=0pt, backspace=1in, margin=0pt, width=fit, height=fit, ] \startbuffer \type{\binom{n}{k}}: $\binom{n}{k}$\par \type{\tbinom{n}{k}}: $\tbinom{n}{k}$\par \type{\dbinom{n}{k}}: $\dbinom{n}{k}$\par \stopbuffer \starttext \title{Binomial coefficients} \startcolumns[n=2] \subject{Default settings} \subsubject{Latin Modern} \getbuffer \switchtobodyfont[pagella] \subsubject{Pagella} \getbuffer \switchtobodyfont[stixtwo] \subsubject{STIX Two} \getbuffer \switchtobodyfont[lucidaot] \subsubject{Lucida} \getbuffer \column[yes] \setupmathfractions[binom][ fences=parenthesis, ] \switchtobodyfont[modern] \subject{With fences=parenthesis} \subsubject{Latin Modern} \getbuffer \switchtobodyfont[pagella] \subsubject{Pagella} \getbuffer \switchtobodyfont[stixtwo] \subsubject{STIX Two} \getbuffer \switchtobodyfont[lucidaot] \subsubject{Lucida} \getbuffer \stopcolumns \stoptext

The result of the code above, with the standalone from 2017-09-05 is given below.