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#1 leexinyi88

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Posted 29 March 2008 - 12:48 PM

A quiz master has 3 boxes, A, B and C. $10,000 is in one of the boxes, and only the quiz master knows where is it. The contestant chose A. The quiz master opens C and it turned out to be empty. The quiz master gave a chance for the contestant to change his choice. Should he change? What is the probability of winning if he change or don't?

Edited by leexinyi88, 29 March 2008 - 12:49 PM.

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#2 grey cells

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Posted 29 March 2008 - 02:01 PM

A quiz master has 3 boxes, A, B and C. $10,000 is in one of the boxes, and only the quiz master knows where is it. The contestant chose A. The quiz master opens C and it turned out to be empty. The quiz master gave a chance for the contestant to change his choice. Should he change? What is the probability of winning if he change or don't?

Spoiler for logically

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#3 rookie1ja

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Posted 29 March 2008 - 03:26 PM

leexinyi88, welcome to the Den

this is a classic puzzle, most recognizably called the Monty Hall problem ... it is already posted (including long discussion) here

btw, it is not 50%

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