perplexus.info :: Probability : The Last Baby

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)

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Puzzle Thoughts	K Sengupta	2023-03-28 09:03:22
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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