An algebra problem by Subrata Dutta

Algebra Level pending

M=8^2+9^2+10^2+.....14^2+22^2+23^2+24^2+.....+28^2+.....................+120^2+121^2+...........+126^2 it can be written as , M/7^2=a+b/7 , then , a+b=?

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