1.

If \(1^2 +2^2 +3^2 + ...+n^2 = \dfrac{n(n+1)(2n+1)}{6},\) find the value of \(5^2 +6^2 + 7^2 + ....+10^2.\)

A. 330
B. 345
C. 355
D. 360
Answer» D. 360


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