\sum_{k=1}^n+\prod_{l=1}^m+(k+l-1)=\frac{1}{m+1}\prod_{l=1}^{m+1}(n+l-1)=
Embed the image to your blog in HTML, Markdown, Textile, BBCode.
Recent Referers:
  1. http://formula.s21g.com/?%5Csum_%7Bk=1%7D%5En+%5Cprod_%7B...
  2. http://formula.s21g.com/?%5Csum_%7Bk%3D1%7D%5En+%5Cprod_%...