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 The Last Baby (Posted on 2003-10-08)
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?

 See The Solution Submitted by Ravi Raja Rating: 2.7778 (9 votes)

 Subject Author Date re: It really does seem too easy. Ben 2003-11-28 01:14:00 It really does seem too easy. Sara 2003-11-10 19:17:32 my take Lee 2003-11-05 00:57:52 Bayes Theorem Robert Bell 2003-11-04 13:17:44 Could be easy. Bill 2003-10-22 13:19:04 this is too easy, so easy that it scares me and i probably will mess up iggyb387 2003-10-15 20:43:25 re: assumption Charlie 2003-10-11 23:01:58 assumption A 2003-10-11 22:30:37 No Subject e 2003-10-09 19:00:47 re(4): I have not read Charlie's post yet FatBoy 2003-10-09 12:36:20 re(3): I have not read Charlie's post yet SilverKnight 2003-10-09 11:21:29 re(3): I have not read Charlie's post yet fwaff 2003-10-09 08:52:48 re(2): I have not read Charlie's post yet FatBoy 2003-10-09 07:33:47 re(3): solution - different manner of looking at this SilverKnight 2003-10-09 02:23:10 re(2): solution - different manner of looking at this Charlie 2003-10-08 22:16:23 re: solution - different manner of looking at this SilverKnight 2003-10-08 16:26:52 re: I have not read Charlie's post yet Charlie 2003-10-08 15:46:02 re: does the lightbulb mean they're right? SilverKnight 2003-10-08 13:52:11 re: does the lightbulb mean they're right? FatBoy 2003-10-08 13:41:47 does the lightbulb mean they're right? matt white 2003-10-08 13:35:35 Who else hasn't read Charlie's post yet? SilverKnight 2003-10-08 13:18:36 I have not read Charlie's post yet FatBoy 2003-10-08 13:04:41 solution Charlie 2003-10-08 10:25:35

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