Maths problems (interesting ones)

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Maths problems (interesting ones)

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#22

08-07-2004, 11:42

Kris Verdeyen Kris Verdeyen is offline

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Re: Maths problems (interesting ones)

Quote:

Originally Posted by Alan Anderson

You're missing the fact that there are two different ways in which the door may be answered by a two-girl family. Your analysis is looking at the probability of a girl answering, which doesn't matter for this problem, because a girl answering is given.

Actually, I'm the only one catching it - it's twice as likely that a girl will initally answer from a G/G family than from a B/G family, and there are twice as many B/G families. Therefore, the other sibling has a 50/50 shot of being girly.

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