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

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

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

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Jun 3, 2015

Here's how that would look

  • Without the hashtags

( (n), (k) )

  • With the hashtags

#( (n), (k) )#

It's the same notation you use to write matrices

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

More examples here:

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

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