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Series and sequences Problem! Help please.

  1. Feb 22, 2015 #1
    1. The problem statement, all variables and given/known data
    Well im stuck with this math problem and i was wondering if you could help me:
    I already solved a), but i stuck with b)

    2. The attempt at a solution
    This is the solution i came up with for a)

    Thanks in advance
  2. jcsd
  3. Feb 22, 2015 #2


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    Homework Helper

    Maybe I don't see the problem. But if ##r_n## is increasing up to a limit ##L<1##, then isn't ##\frac{1}{1-r_n} \le \frac{1}{1-L}##?
  4. Feb 22, 2015 #3
    That might be it, budd. Thanks. But i'd like to hear more suggestions, just in case.
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