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

Home > Just Math
Mission impossible (Posted on 2011-04-18) Difficulty: 1 of 5
I was asked to erase one number from a series 3,13,23,103 and then to erase two members of the remaining sequence, then three and finally four.
I was requested to make sure that after each step of erasures the sum of the remaining members will be divisible by eleven.

Rather than trying to find the "right" order of erasures prove that it cannot be done.

See The Solution Submitted by Ady TZIDON    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
re: solution (spoiler) Comment 2 of 2 |
(In reply to solution (spoiler) by xdog)

Your proof was as I would have given it. Well done.
  Posted by Dej Mar on 2011-04-19 06:27:47

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 (0)
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