Wednesday, December 8, 2010

Boy or Girl Paradox

This is another interesting probability question (under the usual assumption). Here it goes.


A shopkeeper says she has two new baby beagles to show you, but she doesn't know whether they're male, female, or a pair. You tell her that you want only a male, and she telephones the fellow who's giving them a bath. "Is at least one a male?" she asks him. "Yes!" she informs you with a smile. What is the probability that the other one is a male?
Fifty-fifty? Think again!

-Mit freundlichem Gruss und, Heil Schrödingers Katze!

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