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

MCQ

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

A
$2481$
B
$2483$
✓
$2485$
D
$2487$

✓

Answer

Correct option: C.

$2485$

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

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