Originally Posted by woof43

Punter 57 The two-factor probability brings up an interesting category of study... understanding probabilities that aren't exactly straight-forward, or are counter-intuitive. For a person wagering cash money on races, having a firm foundation in probability is a must. Yet all too many people don't! (So much the better for those that DO!
So here's a simple little probability problem to get started. (I'll post the answer later, if need be)
You are told that a family has two children. You are also told that one of those two children is a girl. Assuming that the biological probability of having either a boy or a girl baby is equal (50-50) then what is the probability that the family ALSO has a boy?

Enjoy