explain this problem
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see.... we have a formula for sum of squares
1^2+2^2+3^2+.......n^2=n(n+1)(2n+1)/6
but in the question.. series starts from 5^2..so we applied formula and subtracted 1^2+2^2+3^2+4^2 from that
1^2+2^2+3^2+.......n^2=n(n+1)(2n+1)/6
but in the question.. series starts from 5^2..so we applied formula and subtracted 1^2+2^2+3^2+4^2 from that
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