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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: ( Back to comment list | You must be logged in to post comments.)
Question re: up a tree | Comment 5 of 25 |
(In reply to up a tree by Seth Sauer)

why dont you just pull two balls from the same box?
  Posted by Lucifer on 2003-02-27 13:35:30

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