\starttext

Using \tex{binom} in text $\binom{n}{\frac{n}{2}}$.

Using \tex{dbinom} in text $\dbinom{n}{\frac{n}{2}}$.

Using \tex{tbinom} in text $\tbinom{n}{\frac{n}{2}}$.

\startformula
\binom{n}{\frac{n}{2}}
\stopformula

\stoptext