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@munish : The editorials for this contest are posted . You may have a look at them .
If you have difficulty understanding them you may ask your doubts here .
You can get links to editorials of all problems in the contest here :
where you can register for next months contest and then when you view contest there is link for editorials of previous contest .
You problem’s editorial is at :
https://www.hackerrank.com/blog/infinitum-mar14-summing-the-k-n-series
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