11^2 + 12^2 + 13^2 + .......20^2 = - Vidyadip

Question

${11^2} + {12^2} + {13^2} + {.......20^2} = $

✓

Answer

c
(c) Required sum $\Sigma {(20)^2} - \Sigma {(10)^2} = 2870 - 385 = 2485$.

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