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Relation Between r and a

How many cube...

Question

How many cubes in all have only one side coloured?

A

20

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B

16

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C

0

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D

8

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Solution

The correct option is D 8
All the corner cubes will have more than one side painted.
So on top and bottom surface only the middle cubes will be one side painted.
Therefore, $4 * 2 = 8$
Hence, option 'D' is correct.

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