KöMaL 2012 K324
3 bigger cubes are built out of 99 small red cubes. Then the faces of the big cubes are painted white. Finally, all three big cubes are taken apart again, and a small cube is selected at random. The selected small cube is rolled. What is the probability that it will have a red face on top?
Official text KöMaL. Quoted with source.
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