Stats

How many unique combinations of 5 items be made from a pool of 11 items? And how do I calculate this? I'm assuming there is some relationship w/ factorial involved, but I'm too stupid to work it out.

I think he wants nCr (aka the binomial coefficient).

nCr = n!/(r!(n-r!))

so in your the case, you want 11C5 = 11!/(5!*6!) = 462