[quote]Rico Suave wrote:
Riddle:
There are 4 prisoners and 1 guard. The prisoners are lined up in a straight line as shown (x’s and o’s are prisoners, Y is the guard, and | is a brick wall)
1 2 3 4
x o x | o
Y
---------->
The guard tells the 4 prisoners “I placed a hat on each one of your heads. There are 2 black hats, and 2 red hats. If one of you tell me which colour hat you are wearing, I will let you go free”
All prisoners are facing ONE way. They are not allowed to talk, communicate, touch their hats, stray from the line, turn around, signal to each other, look at their own hat, etc. They are only allowed to face the one way (in which the arrow shows). There is a brick wall in between 123 and 4. Noone can see through, over, around, or under the wall.
Here is how the guard placed the hats on the heads of the prisoners (R = red, B = black)
1 2 3 4
R B R | B
Y
----------->
Which, if any, prisoner will raise their hand and tell the guard what colour hat they are wearing? They only have one guess, and if they are wrong, they will be shot.[/quote]
Prisoner 2 knows that his hat must be black because the guy behind him didn’t say anything. I guess he’d just have to pray that prisoner 1 isn’t a mute or mentally handicapped.
