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Question
How many cubes have at least one of their faces painted black ?
How many cubes have at least one of their faces painted black ?
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Solution
The correct option is D 20
The cubes having t least one of the faces painted black are the 10 cubes along each of the black surfaces i.e. their are 20 such cubes
The cubes having t least one of the faces painted black are the 10 cubes along each of the black surfaces i.e. their are 20 such cubes
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