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Marble and Box

Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.

 

Puzzle ID:#11079
Fun:*** (2.73)
Difficulty:** (1.72)
Category:Probability
Submitted By:electronjohn*us****
Corrected By:boodler

 

 

 



In a box you have 13 white marbles and 15 black marbles. You also have 28 black marbles outside the box. Remove two marbles, randomly, from the box. If they are of different colors, put the white one back in the box. If they are the same color, take them out and put a black marble back in the box. Continue this until only one marble remains in the box. What color is the last marble?




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