2009-03-12, 11:48 PM
(This post was last modified: 2009-03-12, 11:54 PM by ShadyPriest.)
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?
-nvm-