A baby is added to a hospital nursery. Before the baby was added there were two boys in the nursery and an uncounted number of girls. After the new baby is added a baby is selected at random among all the babies. The selected baby is a boy.
What is the probability that the added baby was a girl?
(In reply to
does the lightbulb mean they're right? by matt white)
I'm afraid it doesn't mean that Matt.
As one might notice after reading the postings, two differing (and mutually exclusive) "solutions" both have the lightbulb on. So clearly, at least one would be wrong.
I would encourage you to post if you can offer new information to fellow flooblers!
re: does the lightbulb mean they're right?
