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How would one typeset basic combinatorics, like variation and combination?

For example, when using \(V'_n^k\) for variation with repetition, n and k are not vertically aligned. Something like \(V'\begin{smallmatrix}k\\n\end{smallmatrix}\) comes close, but the spacing is a little to wide, and it isn't left-aligned.

So, what's the best or usual way to do this? (Preferably also working with MathJax.)

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1  
Have you tried \({V'}_n^k\)? – Mico Jan 6 '12 at 2:55
1  
Mico, thank you, that works! (I even remember thinking about it, but somehow I managed to forget about giving it a try.) Will you make that an answer, so I can accept it? – danlei Jan 6 '12 at 3:15
up vote 8 down vote accepted

I suggest the following code:

\( {V'}_n^k \)
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No problem. Let's just delete our comments; you go first. – Mico Jan 6 '12 at 10:46

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