SOLUTION: find the sum of the following series http://prntscr.com/sfipq3

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Question 1158908: find the sum of the following series
http://prntscr.com/sfipq3
Answer by ikleyn(52887) About Me  (Show Source):
You can put this solution on YOUR website!
.

If you don't know the formula for the sum of an arithmetic progression,
you have a happy opportunity to learn it from the lessons

    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions

in this site  (on the free of charge basis).

If,  in opposite,  you DO know this formula,  then do this job on your own.