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

Home > Logic
Logical Nonsense (Posted on 2003-08-26) Difficulty: 4 of 5
  • All, who neither dance on tight ropes nor eat peanut butter, are tall.

  • Creatures with spikey hair who look silly will go swimming if they do not dance on tight-ropes.

  • A kangaroo looks silly wearing sunglasses.

  • A smart creature will always do what he ought to do.

  • No one ought to go swimming who looks silly and eats peanut butter.

  • A smart driver wears sunglasses.

  • Kangaroos that have sneezing fits are avoided.

  • Short creatures who go driving have sneezing fits.

  • No creatures ought to dance on tight-ropes if they have sneezing fits.

  • All, who do not dance on tight-ropes and who are avoided, have spikey hair.
Therefore, no short kangaroos who are smart...

See The Solution Submitted by DJ    
Rating: 4.2105 (19 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
answer | Comment 4 of 13 |
...will go driving.

If a short smart kangaroo goes driving, then we also know:
He does not dance on tight ropes, he has sneezing fits, he wears sunglasses and looks silly, he eats peanut butter, he is avoided, and he has spikey hair.

Since he looks silly and eats peanut butter, he ought not go swimming. Since he is smart, I'll assume he will do as he ought.

Since he looks silly, has spiky hair, and does not dance on tight ropes, he may go swimming. I'll assume this means that there is a possibility that he will go, or that he can go.

Based on that interpretation of those statements, that makes a contradiction, so the kangaroo must not go driving.
  Posted by Talon5000 on 2003-08-27 01:26:31
Please log in:
Remember me:
Sign up! | Forgot password

Search body:
Forums (5)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (1)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2020 by Animus Pactum Consulting. All rights reserved. Privacy Information