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Permutation: n Different Things Taken r at a Time

How many smal...

Question

How many smaller cubes have paint on at least one of their faces ?

A

26

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B

24

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C

27

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D

21

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E

25

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Solution

The correct option is A 26
There will be only one such cube with no paint at all. This cube is the one which has no face displayed in the initial big cube.
Hence all the remaining $26$ cubes will have paint on at least one of their faces

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