If you could do it, it'll be much appreciated.
x^n(1+1/x)^n(1+x)^2=(1+x)^n+2
I obtained that part, but the problem lies in the second part
(n) +2( n ) + ( n ) = (n+2)
(r)-----(r-1)----(r-2)----( r )
Yea, didn't really know how to do that short hand notation for nCk :uhoh:
Whoops editted