# Summation proof

• Feb 25th 2011, 02:16 PM
jstarks44444
Summation proof
Hey all, any help proving the following summation would be greatly appreciated!

Σ from j=1 to k of j^2 = k(k+1)(2k+1) / 6

Thank you!
• Feb 25th 2011, 02:22 PM
Plato
Quote:

Originally Posted by jstarks44444
Hey all, any help proving the following summation would be greatly appreciated!

Σ from j=1 to k of : k(k+1)(2k+1) / 6

Have you written what you meant?
• Feb 25th 2011, 11:03 PM
chisigma
Quote:

Originally Posted by jstarks44444
Hey all, any help proving the following summation would be greatly appreciated!

Σ from j=1 to k of j^2 = k(k+1)(2k+1) / 6

Thank you!

See...

http://www.mathhelpforum.com/math-he...la-172620.html

... taking into account that is $\displaystyle S_{1,n}= \frac{n\ (n+1)}{2}$ ...

Kind regards

$\chi$ $\sigma$
• Feb 25th 2011, 11:08 PM
Prove It