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Math Help - recursion formula's

  1. #1
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    Unhappy recursion formula's

    Can you write the recursion formula for this series? a_n=\frac{1}{2^n}
    Last edited by CaptainBlack; January 11th 2006 at 01:00 PM.
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  2. #2
    Grand Panjandrum
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    You give:

    a_n=\frac{1}{2^n}.

    This as it stands is a sequence not a series, and

    a_{n+1}=\frac{1}{2^{n+1}}=\frac{1}{2^n.2}=\frac{1}  {2}a_n .

    RonL
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