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Famous Series #1: S1=1+2+3+4+5+…+n=n(n+1)/2, Sn=na1+[n(n+1)/2]d
Derive: S2=1^2+2^2+3^2+4^2+…+n^2=?

Firrst video in this series can be seen at:
https://youtu.be/apqSuwipyew