LogFAQs > #877550425

darkknight109 posted...

If I told you I had two kids and suddenly one of them ran up to me and you saw she was a girl, the odds of my second child also being a girl are 50%. This is because you know which child is the girl - the one standing in front of you - meaning the child you don't see has even chances of being a boy or a girl.

But that's not the question as given. The question as given would be if I told you that at least one of my two kids is a girl. You have no way of knowing "which" kid of mine is a girl, meaning there's a 33% chance just the older child is a girl, a 33% chance just the younger child is a girl, and a 33% chance both of them are girls.

It's weird, but the math checks out.

That is super weird! It has to do with the "luck" that just the single girl would run up to you if you had a Boy-Girl pair, right? Since a girl ran up to you, the odds of having two girls increase a little.
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