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Question

A cube of 4 cm has been painted on its surfaces in such a way that two opposite surfaces have been painted blue and two adjacent surfaces have been painted red. Two remaining surfaces have been left unpainted. Now the cube is cut into smaller cubes of side 1 cm each.

How many cubes will have only two surfaces painted with red and blue colour respectively ?

A
8
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B
12
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C
24
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D
30
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Solution

The correct option is A 12
The number of cubes have only two surfaces painted with red and blue colour respectively.
Each surface has 6 cubes having only two faces coloured with red and blue respectively.
So, total there are 6+6=12 cubes.
Hence, option B is correct.

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