1. The problem statement, all variables and given/known data How to find the Sn of this patial sum : 1/n+3 - 1/ n+1 ?? 2. Relevant equations Finding the terms 3. The attempt at a solution In fact, I tried finding s1 and s2 and so on till s6 and I found that the Sn is -1/ n+2 after I canceled the terms, is that right ??