title: Infinite Sums in Excel
body: <p>I was wondering if there is a way to do infinite sums in Excel. I have a sum in the form </p>
  
  <p>= $$\sum_{n=0}^{\infty} f(n)g(n) $$</p>
  
  <p>I was wondering if there is a function to do this in Excel as I dont really want to do a finite sum to a very large number in order to approximate the infinite sum.</p>