The rendering of binomial expressions in MathJax seems a bit off. The spacings are a bit too large in my opinion and it looks a tiny bit asymmetrical.
Inline
Lorem $10+\binom32\times\binom xy$ ipsum.
Displaystyle
$$10+\binom32\times\binom xy$$
Screenshot from my computer (running Chrome on Windows 7):
To be clear, I mean the spacings around the parentheses.
\timesto indicate multiplication :-) To each their own I guess. Compare $$10+\binom32\times\binom xy$$ and $$10+\binom32\binom xy$$ and $$10+\binom32\cdot\binom xy$$ and $$(1,-2,3)\times(2,1,4).$$ In a cross product $\times$ seems to be symmetrically placed. Also in a product of two binomials the centered dot is also asymmetrically placed. May be the problem is with the sizing of that imaginary box surrounding that large parens in the binomial? $\endgroup${}. $$ \begin{array}{c:c} \binom{3}{2}\cdot\binom{x}{y} & \binom{3}{2}\times\binom{x}{y}\\ \binom{3}{2}{\cdot}\binom{x}{y} & \binom{3}{2}{\times}\binom{x}{y}\\ \end{array}$$\begin{array}{c:c} \binom{3}{2}\cdot\binom{x}{y} & \binom{3}{2}\times\binom{x}{y}\\ \binom{3}{2}{\cdot}\binom{x}{y} & \binom{3}{2}{\times}\binom{x}{y}\\ \end{array}$\endgroup$\leftand\right(or constructs that use stretchy delimiters like this). $\endgroup$