Recent content by jediwhelan

brilliant. I was trying something like that but couldn't get it. Thanks for the quick reply. Paul

Homework Statement Dear All, I have a series that I know to converge but for which I can't work out the infinite sum. It should be something simple. S_n = \sum_{j=1}^\infty \beta^j j Can somebody help me with this? I think the solution is: \frac{\beta}{(1-\beta)^2}