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

Home > Logic
Prime Perimeter (Posted on 2005-03-11) Difficulty: 3 of 5

You and two other people have numbers written on your foreheads. You are all told that the three numbers are primes and that they form the sides of a triangle with a prime perimeter. You see 5 and 7 on the other two heads and both of the other people agree that they cannot deduce the number on their own foreheads.

What is the number written on your forehead?

See The Solution Submitted by Erik O.    
Rating: 2.8235 (17 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(3): centering the point | Comment 57 of 89 |
(In reply to re(2): centering the point by armando)

Thank tou, Armando, for your words.

But if you read the comment of emdad, where he concludes that I could have a 3, you'll see that the discussion is far from finishing.

As I answer to him, I THROW THE TOWELL !!!

But I'm convinced that the unique solution is 11, reasoning like I stated, and, until now, no one could find anything to "knock it down".  

 


  Posted by pcbouhid on 2005-03-15 15:49:59
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 - 2021 by Animus Pactum Consulting. All rights reserved. Privacy Information