For some reason my brain isn't working and my friend called me and needs help but I can't figure it out.
There is a bag containing 10 white balls and 9 red balls. How many different combination of balls can be pulled out to yield 6 red and 7 white balls?
For example you can pull out w1-7 and r1-6 for one combination.
I know this is going to be some formula containing factorial in it. Can someone explain to me how to come up with a formula? I'll toss some FG your way.
I'm probably making this question a lot harder than it actually is.