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Q.

1. All the faces of cubes are painted with red colour.
 2. The cubes are cut into 64 equal small cubes

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How many small cubes have only one face coloured?

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a

8

b

16

c

24

d

4

answer is D.

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Detailed Solution

Number of small cubes having only one face coloured = (x - 2)2 × No. of faces = (4 - 2)2 × 6 = 24

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