((n nCr k)(n-k))/(K+1) = (n nCr k+1)
I really need help proving this. However i do not know how to deal with the nCr and factorials at all. I have never had factorials/nCr so i don't know what to do.
Why do you use such words as “thingy” on a serious site such as this?
If that is true then why are you asked to do this question?
If that is true then you will not understand any help we might give you.