Question

Something I don't understand about summatory

Answer 1

I have two :
\[\sum_{i=0}^{n-1} i ^{2} = (n-1)(n)(2n-1)\]

Answer 2

What is the meaning of i^2 ??

Answer 3

\[\sum_{i=0}^{n-1} 1 = (n-1)(n)(2n-1)\]

Answer 4

I don't understand the difference

Answer 5

I just want to know what is the meaning of that term...i've tried to understand from other things and nothing...i've seen 1, i, i^2...but I dont understand what it means

Answer 6

I'm sorry i'm unable to help further than providing this link, I don't really remember summation that well.
If you scroll down a bit it gives an explanation on i, i^2 etc..
http://en.wikipedia.org/wiki/Summation

Answer 7

I could not understand completely

Answer 8

I think I just understood it better...