find the the variable that maximizes a function

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I have a function that I am trying to find for what input it maximizes.

$$ f(n) = {\binom{S}{2}}^{n/S}$$

I need to find the $S$ for which this function maximizes (for infinite $n$). more generally, I need to find the correct $S$ for each given $m$. (in this case $m=2$)

$$ f(n) = {\binom{S}{m}}^{n/S}$$

I think that for the first equation the result is $S=5$ but I am not sure..

How do I approach the second problem? how can I find the maximum based on 2 variables?

EDIT n,S and m are integers.