How can I write the symbol of ”combinations of $n$ $n$ things taken $k$ $k$ at a time”?

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I am familiar with the notation $C_{n}^{k}$ $C_n^k$ , but I noticed that most people on Socratic use this kind of notation: i.imgur.com

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Answer 1 · 2015-06-03T11:52:36

Here's how that would look

( (n), (k) )

$( (n), (k) )$

It's the same notation you use to write matrices

$( (1, 2, 3), (4, 5, 6))$

More examples here: