All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Just Math
The sum of a sequence (Posted on 2004-12-14) Difficulty: 4 of 5
Find the sum of the sequence: x, 2x2, 3x3, 4x4, 5x5, ... , nxn.

See The Solution Submitted by Mohammad    
Rating: 3.4286 (7 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
all the solutions need... | Comment 5 of 10 |

the caveat that when x=1, instead of the given formula, you need to use

n(n+1)/2

as the general formula leads to a division by zero.


  Posted by Charlie on 2004-12-14 18:35:20
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information