Hello, courteous!
How can one present fraction with combinations above and below?
For example, \frac{ 4\choose 4 48\choose 9 }{ 52\choose 13 } gives this:
The "choose" function must be enclosed in braces: .{6 \choose 2}
The code looks like this:
\frac{ {4\choose4} {48\choose9} } { {52\choose13} }
. . .
As Plato pointed out, it can be enlarged
. . by inserting \displaystyle in the numerator and denominator.
\frac{\displaystyle {4\choose4} {48\choose9} } {\displaystyle {52\choose13} }
. . .