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    radius and interval of convergence of each power series

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    Please see attached problems.

    [4] Find the interval of convergence for the following geometric series and, within this interval, find the sum :

    [5] Find the radius and interval of convergence of each power series.

    (a)

    (b)

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    https://brainmass.com/math/real-analysis/radius-interval-convergence-each-power-series-312882

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    The radius of convergence is found.

    $2.19