Hmmm.. I shall have to read my New Scientist. Which edition?
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Originally Posted by Bilbo1967
Interesting post - thanks.
I guess that possible answers are:
1. Possible combinations are; BB, BG, GG. So the probability of it being BB is 1/3
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I think the combinations are BB BG GB GG, i.e. there are two "orders" that you can get one boy, so the chance of BB is 1/4....
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2. If there is at least one boy, then the possible options are BB and BG. The probability in this case is 1/2 for me.
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I think I agree. Basically at this point the question is the same as the probability of one child being a boy.
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3. I have to admit that I am not quite geeky enough for this one - I'm struggling to see the relevance of the birth day of the child. I'm guessing it makes it more likely that they're two boys though? I'm sure somebody will enlighten me shortly 
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I can't help but feel that this is like the probablistic analysis of what you should do when you are given three choices, you choose one, and the one of the remaining two is taken away. Should you change you choice? The answer is yes.
I shall sleep on this one.
And I shall blame you for a sleepless night.....
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