Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

You are not logged in. #1 20090110 12:31:50
Finite sum of a powerHow to calculate If you already know the formulas for for , then you can calculate using the following trick: You expand the LHS and use the formulas you already know. For example, the following formulas should be familiar to most people: You can then apply the above trick to prove that And with that, you can go on and find . And so on, and so forth. #3 20090110 17:43:10
Re: Finite sum of a powerThat is both interesting and very useful! Character is who you are when no one is looking. 