Question

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:

Answer 1

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