1. ## Re: Sum of functions

Originally Posted by GGPaltrow
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.

2. ## 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?

3. ## Re: Sum of functions

Originally Posted by GGPaltrow
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?

4. ## Re: Sum of functions

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

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