There are 3 bags on the table. The first bag contains a white ball and a black ball. The second bag contains two white balls. The third bag contains two black balls. They are all labelled on the outside accordingly.
Mr. Mallory comes and switches all the labels, so that they are all wrong.
You come along to the scene, aware of what Mr. Mallory did. Unfortunately, you do not know the original arrangement of the labels.
How many balls must you pick out from the bags before you can recover the original arrangement of the labels?
The solution can be found here: http://hectorhon.blogspot.com/2013/10/picking-balls-from-bags-solution.html
ReplyDelete