Maths problems (interesting ones)

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Maths problems (interesting ones)

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07-07-2004, 11:44

FizMan

aboot, eh?

AKA: Chris Sinclair

#0783 (Mobotics)

Team Role: Alumni

Join Date: Feb 2004

Location: Toronto, Canada

Posts: 102

Re: Maths problems (interesting ones)

Right on each one? What aboot the scale one? Are both me and Alan right?

And Dave, not quite on the money there... consider all the possible combinations:

Boy -> Girl
Boy -> Boy

Girl -> Girl
Girl -> Boy

We are asked what's the probability that they have two girls. We KNOW that they have 1 girl already, so that eliminates the Boy->Boy possibility.

Which leaves us with 3 possible outcomes.

Boy -> Girl
Girl -> Girl
Girl -> Boy

So what are the chances they had Girl -> Girl? 1/3 (or 33%)

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