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Billy's bag (Posted on 2005-04-17) Difficulty: 2 of 5
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
SolutionPuzzle SolutionK Sengupta2008-12-14 06:55:55
AnswerK Sengupta2008-12-12 13:04:20
No SubjectSean2005-10-26 13:31:38
Some Thoughtsa wrong guess?tanx2005-10-15 00:21:26
dddddddAndy2005-05-07 19:08:47
dddAndy2005-05-07 19:08:30
re(2): more manuallydqbombo2005-05-02 22:54:33
re(2): more manuallyarmando2005-04-19 15:56:16
If Billy is lookingowl2005-04-19 03:09:55
re: more manuallyBruce2005-04-18 21:16:48
re: 3 casesarmando2005-04-18 16:00:46
3 casesThe riddler2005-04-17 22:59:49
more manuallyarmando2005-04-17 21:56:02
SolutionNo SubjectStephen Ticsay2005-04-17 21:16:38
re(2): SolutionTomM2005-04-17 17:54:24
re(2): Solutionnp_rt2005-04-17 17:17:14
re: SolutionCharlie2005-04-17 17:04:01
Solutionnp_rt2005-04-17 16:44:44
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