|Create Account – Sign in
The Three Doors
There are countless variations of this problem, with lions and virgins
hidden behind doors, and poor prisoners that have to chose a door
and get eaten or survive. This version here is less violent and has an interesting twist:
And the question to you: should Mike go with the door
he originally chose, or should he switch? What is the
probability that he wins?
The quiz master explains: You are allowed to open one of three doors,
if you open the correct one you will find a chest with hundreds of diamonds.
Open one of the other two doors and you will get nothing!
Mike looks at the three doors, but they all look the same, there
is no hint as to which one is the correct one. Finally he says:
"I choose this door" and points to one of them.
The quiz master looks at him and replies: "today I am in a good
mood, and therefore I will now give you a hint: I will open
one of the two doors you did not chose, and will show
you that this is one of the wrong doors". He goes over
and opens one of the remaining doors and everyone can see
that there is nothing behind it.
He continues "Now I give you a second chance: you can either
go with the door you originally chose, or switch to the other
door that is still closed".
Hint: If Mike plays the game correctly he can boost
the probability of a win to well over 50%!
This problem is known as the Monty Hall Problem
and many web pages discuss it.
Use this feature to comment on this page, to suggest features, ask question or propose changes. Comments are shown in a threaded format, with newer comments at the top.
The Fine Print: The following comments are owned by whoever posted them. We are not responsible for them in any way.
You need to signin if you want to post a comment