Prime - Calculate sum of a sequence

[Bill Zimmerly]

(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.