Question

.
Find
$1 {}^{2} + 2 {}^{2} + ............. + 10 {}^{2}$
​

Answer 1

Answer:

n(n+1)(2n+1)/6

1² + 2² + 3² + .... + 10² = 10*(10+1)(2(10)+1)/6

= 10*11*21/6

= 5*11*7 = 385