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Thread: sum operator

  1. June 30th 2012, 01:50 AM #1
    Emilijo
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    sum operator

    Is there formula for getting f(k) if I know F(n) in this equation:

    sum_(k=1, to n) f(k) = F(n)

    for example:

    sum_(k=1, to n) f(k) = n^3

    f(k)=?
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  2. June 30th 2012, 02:27 AM #2
    girdav
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    Re: sum operator

    What is F(n)-F(n-1)?
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