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9-15.
  1. Ying has a different method for summing an infinite series. Here are her steps: Homework Help ✎

    1. Let S = the sum.

    2. Separate the first term from the rest of the series.

    3. Factor the rest of the terms so that the remaining factor is S .

    4. Substitute S for the other factor.

    5. 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.