1. The problem statement, all variables and given/known data Determine whether the series [PLAIN]http://img265.imageshack.us/img265/69/44751948.jpg [Broken] converges or diverges and find its sum S if it does converge. 2. Relevant equations 3. The attempt at a solution my textbook has lots of weird examples but none of them help me understand how to solve this one.. if i plug in 1 then 2 then 3.... i get ln(1.5) + ln(1) + ln (7/8) +...+ln((2n+1)/(3n-1)) so a = ln(1.5) r = ? then i use the formula: a / (a-r) right? now how do i find r?