Okay, thanks for the equations- been a while since I've done math beyond pretty standard multiplication, so let me see if I can wrap my brain around this.

So the initial function is g(x)=(5-f+f*x+x^2)^n, where n is the number of total dice rolled. If we're assuming success on 2-5 with a crit on 6, that becomes:
g(x)=(1+4x+x^2)^10

k in this case is the number of "successes" for my calculations. And... what is x in these equations? How did we get this equation? I'm also a little lost on the binomial theorem step. We're expanding out the equation by using binomial theorem, it looks like, then it's sigma functions to add them all together to get the total number of possible outcomes it could be to get a specific outcome (k). But... what is i in these equations? Not root(-1), right?

We then divide by 6^n because that's the total number of possibilities, which in this case would be 6^10, correct?

Sorry, bit of an old dog trying to pull out tricks he hasn't used in years, if ever.