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Thread: 2 in 1

  1. #1
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    2 in 1

    Hey guys, can you help me with this on please?
    First one, I need to proof convergence, and the second one is to find the radius of converge.
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  2. #2
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    The first series in the part A does not necessarily converge.
    If $\displaystyle a_n = 2 + n$ then $\displaystyle \sum\limits_{n = 1}^\infty {\frac{1}{{a_n }}} = \sum\limits_{n = 1}^\infty {\frac{1}{{2 + n}}} $ diverges.
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