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Friday Q&A: 92% of people get this question wrong
Posted by on Mar 18th, 2011

Older Life is Savage readers will remember that every Friday i did a post that presented a puzzle or a paradox with a solution that is not as easy as it looks. I think it’s time to bring back some of those old questions since there are so many new readers and followers now.

See if you can figure this puppy out.

The following problem was presented in a column in a magazine by Marilyn vos Savant (yes that’s where the word Savant comes from) and it completely stumped 92% of people who answered..including maths professors and fellow clever folks.

The Monty Hall Problem:

Suppose you’re on a game show, and you’re given the choice of three doors: Behind one door is a car; behind the other two doors are goats. You are asked to pick a door that is not opened. The host, who knows what’s behind the doors, opens one of the other doors and reveals a goat. He then says to you that you have one last chance to change your mind and pick the other unopened door if you want. What should you do?


See now my buddy Duncan reckons that its 50:50 and he may as well stick with his initial choice.

Wrap your brain around that one. What do you think?

What if i told you you should always change your initial choice….

……………………..Answer is below, but don’t cheat……………………………………………….

Diagram solution HERE

Mathematical solution HERE ( ya you gonna make sense of this, but go ahead fool yourself and try)

Good times.

Frederich says:
March 03, 2011 at 11:32 am

Door 1: You stick you get a goat, you change you can still get another goat??? Not true?

Adam W says:
March 03, 2011 at 11:32 am

Do I get to keep both goats? If I got the car I would swap it for the goats anyway. No matter how I look at it I win!

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