Find the sum of n terms,

1+4+9+16+...+n²

I stumbled upon a problem in physics where I had to figure it out.

Dear student

 

Just remember this formula that

 

1²+ 2² + 3² + 4² + 5² +........+ n² = n (n+1)(2n+1) /6

 

Hope it helps

 

Regards

Arun (askIITians forum expert)

Please post a proof for this formula. Because otherwise it would just get skipped from my head within a few days if I didn't know from where this formula came... Sir please do me this favour...