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Math Help - Convergence: The domain and radius

  1. #1
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    Convergence: The domain and radius

    I did the following calculations.
    I need to find the domain and radius.
    I think the radius is (-R,R) AKA (-2,2).
    What is the domain ? I think it should be in the form of (a-R,a+R). If, how do I determine "a" ?
    What does imply that it is the convergent series ?
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  2. #2
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    This has nothing to do with number theory post in correct subforum.
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