# Thread: Need Help!!

1. ## Need Help!!

I'm actually working on a math project and I can't solve this equation. I know it gives 0, but I can't show why.

add means SUM x=0 .. y
I have to do the (lim y->inf) of this function!

Thank You

EDIT: also, the SUMx=0..y equals 2^y

2. ## Re: Need Help!!

you lost me with the edit.

do you mean this?

$z=\dfrac{\left(\begin{array}{c}y \\ \frac{x+y}{2}\end{array}\right)}{\displaystyle{ \sum_{x=0}^y} \left(\begin{array}{c}y \\ x\end{array}\right)}$

and you want to show $z=0$ ? It's pretty clearly not 0 as all those terms are positive.