Red and Blue - Logic Puzzle

Monday, May 4, 2009

3 boxes of marbles sit in front of you, all of them are mislabeled.

Box 1 reads : Red
Box 2 reads : Blue
Box 3 reads : Red and Blue

Only removing one marble from one box, without knowing any other contents of the box, can you correctly place the labels?

Solution (Highlight): Remove one marble from the 3rd box. If it is red, move label 1(Red) to label 3. Because Box 2 is labeled incorrectly it must be Red and Blue. That leaves Box 1 to be Blue.