2009-03-12, 11:17 PM
Spaz Wrote:Read the question carefully, guys. It doesn't say "the first kid is a boy", it just says one is. These are the 4 possibilities, with equal probability, without knowing anything other than there are 2 kids:
BB
BG
GB
GG
If the question did say "the first kid is a boy" then it would be:
BB
BG
GB
GG
And it would be 50% chance of the other being a boy. But it doesn't say that, it just says one of the two is a boy. That makes it:
BB
BG
GB
GG
and therefore 33% chance of them both being boys.
Anyone want to make a post about the birthday paradox?
Yes, it says 1 of them is a boy. The question is reffering to the "other" one, so doesn't that mean that it is reffering to the one that isn't a boy? It doesn't matter if it is the 1st or 2nd that is definitly a boy, my arguement of the question reffering to the other one still holds.