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+--- Thread: Prime - Calculate sum of a sequence (/thread-2017.html)
Prime - Calculate sum of a sequence - paul.hermans@benemtech.com - 08-26-2014 05:01 AM
If I have a sequence defined as:
an = 256(.25)^(n-1)
I can use the series app to evaluate various terms
How do i then determine the sum of the first 24 terms? I know how to do it by hand, but wondering if there is a quick function that I missed that does this for me.
Thanks
Paul
RE: Prime - Calculate sum of a sequence - Bill Zimmerly - 08-26-2014 06:31 AM
(08-26-2014 05:01 AM)paul.hermans@benemtech.com Wrote: If I have a sequence defined as:
an = 256(.25)^(n-1)
I can use the series app to evaluate various terms
How do i then determine the sum of the first 24 terms? I know how to do it by hand, but wondering if there is a quick function that I missed that does this for me.
Thanks
Paul
1. Apps "Function."
2. Set F1(X)=256*(.25)^(X-1).
3. Home.
4. "Template" button (the third one to the right from "Vars."
5. Choose the Sigma summation (down two, right two).
6. Set X=1 to 24 and F1(X).
I got 341.3333333334 as the answer.
RE: Prime - Calculate sum of a sequence - Joe Horn - 08-26-2014 12:01 PM
(08-26-2014 06:31 AM)Bill Zimmerly Wrote:(08-26-2014 05:01 AM)paul.hermans@benemtech.com Wrote: If I have a sequence defined as:
an = 256(.25)^(n-1)
I can use the series app to evaluate various terms
How do i then determine the sum of the first 24 terms? I know how to do it by hand, but wondering if there is a quick function that I missed that does this for me.
Thanks
Paul
1. Apps "Function."
2. Set F1(X)=256*(.25)^(X-1).
3. Home.
4. "Template" button (the third one to the right from "Vars."
5. Choose the Sigma summation (down two, right two).
6. Set X=1 to 24 and F1(X).
I got 341.3333333334 as the answer.
If you really do want to use the Sequence app instead of the Function app, follow Bill's instructions but use U1 instead of F, and N instead of X. But this particular example doesn't define the sequence based on previous terms (which is what the Sequence app does), so the Function app is more apt for it.
RE: Prime - Calculate sum of a sequence - paul.hermans@benemtech.com - 08-26-2014 10:47 PM
Thanks guys, that is exactly what I needed.....never thought to do it that way at all.
Still learning my way around this calculator.
Paul
RE: Prime - Calculate sum of a sequence - Bill Zimmerly - 08-27-2014 06:12 AM
You're welcome, Paul.
- Bill