Okay,

One more question. This section of the book is pretty spotty.

Find a closed for for the generating function for the sequence a(n) = $\displaystyle \binom{n}{2}$ , for n=0, 1, 2.

There is the table for generating functions and I was looking at 1/(1+x)^n but I don't really think that is correct.

Also I tried to use the math tags to make it more legible for once. Hopefully I least got that right.

Thanks