How many smaller cubes have only one face painted?

32

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24

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16

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8

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Solution

The correct option is B $24$
So on a painted side all border boxes will have more than one side painted . that means in a surface middle 4 boxes will have only 1 side painted. and we have 6 surfaces.
Therefore, the answer is $= 4 * 6 = 24$
Hence, option 'B' is correct.

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