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Friday Riddle

nudgie's picture
nudgie
Posts: 1483
Joined: Sep 2006

NO GOOGLING OR SEARCHING ON THE INTERNET ALLOWED!!!

RIDDLE: You are on a spaceship with 2 computers. You have 2 doors, one leads to a room with the spacesuits, the other opens directly to outer space (and certain death). Both computers know which door is safe and which is not. One problem is that one computer can only tell the truth and the other can only lie. The other problem is there is no way to know which computer is which.

What is the one question that you can ask EITHER computer that will guarantee directions to the door leading to the room with space suits?

PGLGreg's picture
PGLGreg
Posts: 741
Joined: Jul 2006

"Would the other computer say the left door leads to the spacesuits?" ("Yes" means it's the right door, and "no" means it's the left door.)

--Greg

PhillieG's picture
PhillieG
Posts: 4888
Joined: May 2005

and you asked the lying computer if the left door leads to the spacesuit, it would say NO. If you asked it what the other computer would say, it would say YES (because it lies)

Then you asked the truthful computer if the left door leads to the spacesuit, it would say YES. If you asked it what the other computer would say it would tell you NO.

I'm on chemo so I guess I'm missing something here.
This isn't like trying to cure cancer so it's not important but I don't think that based on asking one computer one question that you can derive the answer, but like I said, I'm on chemo.

Thank God I'm not in space (just spaced out). I'm still trying to figure out what to wear today, I don't think it will be my spacesuit
-p

PhillieG's picture
PhillieG
Posts: 4888
Joined: May 2005

Dave, why do you want to leave the spaceship Dave?
I'm sorry but I can not let you jeopardize the mission Dave.

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