Sunday, March 23, 2008

"Lets make a deal": door probabilities

One of the best Straight Dopes... interesting in a mathematical kind of way... but don't worry, totally understandable if you read it over and over.

Link

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?

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