What does this mathematical notation mean? Please excuse this simple question, but I cannot seem to find an answer. I'm not very experienced with math, but I keep seeing a notation that I would like explained. The notation I am referring too generally is one variable m floating over another variable n enclosed in paraentheses. You can see an example in the first equation here.
What does this mean? Thanks in advance for the help.

That notation is read "$n$ choose $m$", and it indicates the number of ways one can choose $m$ objects from a collection of $n$ objects, if we don't care about "order".  Think about a bag of 10 things...how many different ways can I pick 5 objects out of the bag?  That number is $\binom{10}{5}$.
