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

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I am familiar with the notation #C_n^k# , but I noticed that most people on Socratic use this kind of notation:

I am familiar with the notation

##### 1 Answer

Jun 3, 2015

Here's how that would look

*Without the hashtags*

( (n), (k) )

*With the hashtags*

It's the same notation you use to write matrices

More examples here:

http://socratic.org/questions/how-to-write-matrices-on-socratic?source=search