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9-15.

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 the following problem. The first three steps are done for you. Copy them, then complete the solution.

Problem:

Start of Solution: