AL2006
contestada

It's a beautiful Spring day, and I am out for a walk in the woods.
Suddenly, I come to a large mysterious red door, guarded by two large guards.
A sign on the door says:
==> "You are allowed through this door only if you KNOW whether or not it is locked. You may not try the door, but you may ask one guard one question."
A sign stands behind the guards. It says:
==> "One of these guards ALWAYS tells the truth. The other guard ALWAYS lies."

Is it possible for me to ask ONE guard ONE question, and find out whether or not the door is locked ?

Respuesta :

Menem

Answer:

The possibility of gaining the answer, the gate being locked or unlocked is null.

Explanation:

The sign behind the guards informs that one guard lies another speaks truth. However if I ask one guard regarding the gate, I wouldn't get the answer as I don't know if the guard is a lier or trustworthy. Therefore, even if the guard is a truth- sayer, I won't believe it. My doubts will remain unanswered.

Hope I gave the correct answer, I did my level best.

Thank you Al

Otras preguntas