Ying has a different method for summing an infinite series. Here are her steps: Homework Help ✎
Let S = the sum.
Separate the first term from the rest of the series.
Factor the rest of the terms so that the remaining factor is S .
Substitute S for the other factor.
Solve for S.
Apply Ying's method to find S in the following problem. The first three steps are done for you. Copy them first, then complete the solution.