Six colors of paint are available. Each face of a cube is to be painted a different color. In how many different ways can this be done if two colorings are considered the same when one can be obtained from the other by rotating the cube?
A
5
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B
6
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C
30
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D
6!
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Solution
The correct option is C30 A cube can be rotated into 6×4=24 configurations (i.e. the red face can be any one of the 6, and then there are 4 ways to rotate it that keeps that face red) So the number of different colourings (counting rotations, but not mirror reflections, as the same) is 6!24=30