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Math Help - Sum of functions

  1. #16
    MHF Contributor alexmahone's Avatar
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    Re: Sum of functions

    Quote Originally Posted by GGPaltrow View Post
    Thank you very much, alexmahone! So I should make something like this for other cases like those you mentioned in #11 or it summarizes it all?
    Post #13 is the complete solution.
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  2. #17
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    Re: Sum of functions

    Fabulous, thank you very much. How did you get from 2^{n-2}+2^{n-3}+2^{n-4}+...+1+1 to 1\left(\frac{2^{n-1}-1}{2-1}\right)+1, though?
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  3. #18
    MHF Contributor alexmahone's Avatar
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    Re: Sum of functions

    Quote Originally Posted by GGPaltrow View Post
    Fabulous, thank you very much. How did you get from 2^{n-2}+2^{n-3}+2^{n-4}+...+1+1 to 1\left(\frac{2^{n-1}-1}{2-1}\right)+1, though?
    Do you know how to sum a GP?
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  4. #19
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    Re: Sum of functions

    ...
    Completely forgot it's a GP. Sorry and thank you at once
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