1. The problem statement, all variables and given/known data Ʃ(x-->infinity, x>0) 11/(n(n+2)) 2. Relevant equations 3. The attempt at a solution I am not quite sure what to do, i think that i am supposed to put it into partial fractions. i changed it to the form 11/(n^2+2n) --> 11/((n+1)(n+1)-1)) --> 11/((n+1)^2-1) Now i am kind of stuck, i know the answer is 33/4 but i am not sure how i can get to it. Can anyone please help me out? Also, can this be considered a geometric series?