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[FOM]Puzzle 1+4+9+16+...+100=?
- Thread starter Alphlax
- Start date
Hello, Alphlax!
You are asked to add: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100.
1 + 4 + 9 + 16 + ... + 100 = ?
I know in between is +3+5+7 but is it like 2n(99)? What does that mean?
You are asked to add: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100.
Why is it something over six?\(\displaystyle \displaystyle \sum_{i=1}^n i^2 = \dfrac{n(n+1)(2n+1)}{6}\)
Why is it something over six?
Because that is what the formula is.