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A solid cube of each side 8 cms, has been painted red, blue and black on pairs of opposite faces. It is then cut into cubical blocks of each side 2 cms.
How many cubes have two faces painted red and black and all other faces unpainted ?

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answer is B.

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Detailed Solution

There are cubes which are in edges with red and black

$∴$ Each edge 2 cubes

So 4 edges $= 4 \times 2 = 8$

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