Goats and Cars Quiz Puzzle

This week we have quite a famous puzzle, but one that's worth sharing if you've not seen it. And it's an interesting and counter intuitive puzzle as well! 

It first came to prominence in 1990 as a reader's question to Marilyn vos Savant's column in Parade magazine:

Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. 1, and the host, who knows what's behind the doors, opens another door, say No. 3, which has a goat. He then says to you, "Do you want to pick door No. 2?" Is it to your advantage to switch your choice?


This is loosely based on an actual game show where this was the problem given to contestants.

So, you are on the game show you are asked to pick a door. You do so and the host opens one of the other two doors to reveal a goat. You can stick with your original door or change to the other unopened door. Do you stick? Do you change? Or does it make no difference?

As usual you can post the answers as a comment on this website, reply to the post on Facebook, or retweet or reply on Twitter @quizmastershop.

Answer at 9.00 on Monday


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