1. The problem statement, all variables and given/known data and in this case we have, [PLAIN]http://tutorial.math.lamar.edu/Classes/CalcII/ConvergenceOfSeries_files/eq0016MP.gif[PLAIN]http://tutorial.math.lamar.edu/Classes/CalcII/ConvergenceOfSeries_files/empty.gif [Broken] 2. Relevant equations I can not see how they get either of the 3 terms or where the 3/4 term comes from. Once given the expression, its easy to see it converges to be 3/4. 3. The attempt at a solution Even if I limit shift to either i=0 or i=1, I can not see this solution. Wolfram Alpha confirms 3/4 is the correct answer. Thanks for your help.