One of the series in Exercises 49 converges to its sum at a much lower rate than the other five series. Which is it? Explain why this series converges so slowly. Use a graphing utility to illustrate the rate of convergence.

Data from in Exercises 49

In Exercises find the sum of the convergent series by using a well-known function. Identify the function and explain how you obtained the sum.

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-| Σ (-1)^+1. n=1 1 2"n