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

Home > Shapes
Inverting Triangles (Posted on 2005-08-15) Difficulty: 1 of 5
A piece of paper had the following diagram:
               o              o o o o
      From:   o o         To:  o o o
             o o o              o o
            o o o o              o
Below it, it read "Given the initial formation of ten coins, move exactly # coins to produce the end formation." It was pretty obvious that # stood for a digit, but it was smudged and couldn't be read. What possible numbers could it have been so the problem was solvable?

To allow explaining the solution, number the coins like this:

           0 
          1 2
         3 4 5
        6 7 8 9
Note: This problem was inspired by a forum question by Nicole.

No Solution Yet Submitted by Erik O.    
Rating: 2.1429 (7 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: 7 ways | Comment 9 of 15 |
(In reply to 7 ways by Lisa)

Hi Lisa, as "# stood for a digit" I don't think 10 moves qualifies as one of the possible solutions.
  Posted by Nosher on 2005-08-16 02:37:50

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 (14)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2024 by Animus Pactum Consulting. All rights reserved. Privacy Information