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Problem Seven: Critical Moment

Sep 27th, 2006 by tony

This is probably one of the most famous puzzles of all time, but I’ll post it here anyways in case someone hasn’t seen it before.

In a game show you can pick one of three doors. A,B or C. One of the doors holds the car you got your eyes on. The others contain goats. You guess door A. The host (knowing which door holds the prize) opens one of the 2 other doors that he knows holds no prize. He opens door B. He tells you to try again, and pick one of the 2 doors that are left, A or C. Which door should you pick?

Update: Solutions have been posted.

Posted in Classic | 10 Comments

10 Responses to “Problem Seven: Critical Moment”

  1. on 27 Sep 2006 at 9:41 pm   Jen

    Huh? am i retarded? did i read that question wrong? … A?

  2. on 27 Sep 2006 at 9:43 pm   Percy

    C! :D

  3. on 27 Sep 2006 at 9:44 pm   tony

    It’s not A. Sooooooo, “retarded” or “read the question wrong”?

  4. on 28 Sep 2006 at 9:44 am   Jolanda

    Why would it make a difference ?? :-X

  5. on 28 Sep 2006 at 1:19 pm   Eilidh Southren

    Ah, the answer to this is in the book “The Curious Incident of the Dog in the Night Time”. It says you should swap your door to C… but I can’t remember why.

  6. on 28 Sep 2006 at 2:43 pm   Sarah & Heather

    wait, why did he open door b?
    i think this game show needs a new host..

    well since you guessed door A before, and then he told you to guess again, and door B had already been opened..C is the only door left right?

  7. on 28 Sep 2006 at 4:48 pm   Jolanda

    He opened B, but the door with the prize could still be A or C. He’s letting you guess again, but made no indication whether your initial guess of A was right.

  8. on 28 Sep 2006 at 11:35 pm   tony

    Hint:

    Show ▼

  9. on 24 Oct 2006 at 9:59 am   erich

    This is the monty hall problem. Look it up because it takes a little explaning to make clear. By the way the answer is C

  10. on 11 Nov 2006 at 8:40 am   mark

    damn… yeah it’s the monty hall problem but the answer is not “C” .. it could be..
    and i say it again.. it could be “c”
    because it has a higher probability..

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