$6^{2} + 7^{2} + 8^{2} + 9^{2} + 10^{2} =$ ___ .

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Solution

$S u m o f s q u a r e s o f 1^{s t} 10 n a t u r a l n u m b e r s - S u m o f s q u a r e s o f 1^{s t} 5 n a t u r a l n u m b e r s$
$S u m o f s q u a r e s o f 1^{s t} n n a t u r a l n u m b e r s = \frac{n (n + 1) (2 n + 1)}{6}$

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