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Math Help - Radius of convegence

  1. #1
    VkL
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    Radius of convegence

    Use the ratio test to find the radius of the convergence of the power series.



    How do I start this? I need to find a common expression first?
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  2. #2
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    Quote Originally Posted by VkL View Post
    Use the ratio test to find the radius of the convergence of the power series.



    How do I start this? I need to find a common expression first?
    nth term is \frac{(2n+1)x^n}{n}

    now use the ratio test, setting the limit to be less than 1
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