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Black and White (Posted on 2003-02-25) Difficulty: 2 of 5
Imagine that you have three boxes, one containing two black balls, one containing two white balls, and the third containing one black ball and one white ball.

The boxes were originally labelled for their contents (BB - WW - BW) but someone has inadvertently switched the labels so that now every box is incorrectly labelled.

Without looking inside, you are allowed to take one ball at a time out of any box that you wish, and by this process of sampling, you are to determine the contents of all three boxes.

What is the smallest number of drawings needed to do this?

See The Solution Submitted by Ravi Raja    
Rating: 3.1250 (8 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionanswerStephen Ticsay2005-10-29 13:52:41
answergabbo2004-09-15 22:46:12
Balls!Denis Cronin2003-09-21 20:32:49
SolutionNo SubjectCaitlin2003-07-29 16:55:13
SolutionSolutionLewis2003-06-21 08:23:18
Solutionre: I believe it to be...Nich2003-06-10 08:06:40
umm my guess againJon2003-04-11 05:57:33
re(3): what do you mean not the answer?Ravi Raja2003-03-01 22:00:30
re(2): what do you mean not the answer?Lucifer2003-03-01 09:13:50
re: what do you mean not the answer?Ravi Raja2003-02-28 19:14:15
re:Ravi Raja2003-02-28 19:11:13
re: hiRavi Raja2003-02-28 19:08:57
re: i believe, does anyone?Ravi Raja2003-02-28 19:06:08
No SubjectLucifer2003-02-28 12:33:05
Questionwhat do you mean not the answer?Lucifer2003-02-28 12:30:50
hiGale2003-02-28 10:56:25
i believe, does anyone?fad2003-02-28 01:48:08
re: up a treeRavi Raja2003-02-27 20:25:34
re: I believe it to be...Ravi Raja2003-02-27 20:17:43
Questionre: up a treeLucifer2003-02-27 13:35:30
SolutionI believe it to be...Lucifer2003-02-27 13:32:58
up a treeSeth Sauer2003-02-26 05:59:13
re: ballroom dancingE Woodford2003-02-25 05:22:42
ballroom dancingNick Murray2003-02-25 02:07:09
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