question_answer

The value of \[{{1}^{2}}+{{2}^{2}}+{{3}^{2}}+.....+{{n}^{2}}\]is

A)  \[\frac{n(n+1)}{2}\]         

B)         \[\frac{n(n+1)(2n+1)}{6}\]  

C)  \[\frac{n(n+1)(2n-1)}{6}\]

D)         \[{{\left[ \frac{n(n+1)}{2} \right]}^{2}}\]