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 Billy's bag (Posted on 2005-04-17)
On a table there are two bags. The first contains one white marble. The second bag contains one red and one white marble. Blindfolded, Billy takes one marble out of the second bag and puts it in the first bag. He then takes off his blindfold and takes a marble out of bag one. It is a white marble.
What is the probability that the other marble in the first bag is also a white marble?

Dutch National Science Quiz 12/24/2004

 See The Solution Submitted by Hugo Rating: 3.0000 (2 votes)

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 Subject Author Date Puzzle Solution K Sengupta 2008-12-14 06:55:55 Answer K Sengupta 2008-12-12 13:04:20 No Subject Sean 2005-10-26 13:31:38 a wrong guess? tanx 2005-10-15 00:21:26 ddddddd Andy 2005-05-07 19:08:47 ddd Andy 2005-05-07 19:08:30 re(2): more manually dqbombo 2005-05-02 22:54:33 re(2): more manually armando 2005-04-19 15:56:16 If Billy is looking owl 2005-04-19 03:09:55 re: more manually Bruce 2005-04-18 21:16:48 re: 3 cases armando 2005-04-18 16:00:46 3 cases The riddler 2005-04-17 22:59:49 more manually armando 2005-04-17 21:56:02 No Subject Stephen Ticsay 2005-04-17 21:16:38 re(2): Solution TomM 2005-04-17 17:54:24 re(2): Solution np_rt 2005-04-17 17:17:14 re: Solution Charlie 2005-04-17 17:04:01 Solution np_rt 2005-04-17 16:44:44

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