I'm trying to figure out some math problems.
In particular I have this "In an office you have 6 clerks. How many ways can you select a team of 3 clerks?" and the solution given is: $\binom{6}{3} = \frac{6!}{3!*3!} = 20.$
I don't really understand how that works, so I'm trying to find some tutorial, but how exactly is this equation even called? I can't search for it, because I have no idea what I'm searching :)