Re: Riddle Time. -- Stake Play Kids!

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Date Posted: 23:13:13 09/15/03 Mon
Author: Neil
Subject: Re: Riddle Time.
In reply to: adeline-yes i ammm doing my math hw right now 's message, "Re: Riddle Time." on 21:59:17 09/15/03 Mon

Correct Adeline. Althought the more common answer I've seen is that he leaves one on; so one light is on, one is off but warm, and one is off and cold.

Another one: There are four prisoners. They are standing in a line waiting to be executed. Between prisoner #1 and #2 there is a brick wall:

1 (wall) 2 3 4

All prisoners are facing forwards in line (to the left in my little drawing). They can only see the prisoners in front of them, but can't see through the brick wall. (In other words, #3 can see #2, and #4 can see #3 and #2.)

Prisoner #1 is wearing a black hat.
#2 is wearing a white hat.
#3 is wearing a black hat.
#4 is wearing a white hat.

No prisoner knows what color hat they're wearing. They only know the colors of the hats that they can see on the prisoners in front of them, and they can't see through the wall. However, they all know that there are two black hats and two white hats among the four of them.

The executioner says, "If any of you can tell me what color hat you're wearing, you will live. If you guess wrong, you will die first." There is a minute of silence. Then, one of the prisoners announces their hat's color correctly. Which prisoner is it?

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