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Question

How many cubes have only one face painted red and all other faces unpainted? 


A
18
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B
27
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C
24
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D
36
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E
12
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Solution

The correct option is A 18
Such cubes are
$$\displaystyle \frac{1}{3}\left [ 6\left ( \frac{10}{2}-2 \right )^{2} \right ]=\frac{1}{3}\times 54=18$$

Mathematics

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