Arithmetic Progression - 10. Finding sum of first n number of terms of an AP

Hi Friends,
In this tenth webisode of our series - "Series-8: Arithmetic Progressions", we look at how

to find the sum of first "n" number of terms in an given AP i.e. if we are given a AP, how

are we going to find out the sum of the first n terms.
This video is suited for class-10 (class-X) students.
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Cheers,
Friends at Risingpearl.