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All external faces of a cube are painted red, and the cube is then sliced into 3x3x3 identical cubes. The center is discarded and one of the 26 external pieces is selected at random. What is the expected number of red faces?
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Trader Intern

Interviewed at Five Rings

3.7
Jul 20, 2022

All external faces of a cube are painted red, and the cube is then sliced into 3x3x3 identical cubes. The center is discarded and one of the 26 external pieces is selected at random. What is the expected number of red faces?

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