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Q.

 

The surface area of a cube of dimensions  n×n×n is painted and it cut into n cubes of equal length (1 unit), then number of 2 faces painted cubes are

 

 

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a

8 n2

 

b

6 n2

 

c

4 n2

 

d

12 n2

 

answer is C.

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Detailed Solution

 

Surface area of cube of dimension

n×n×n

are painted

Number of 2 faces painted cubes

=12 n2

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 The surface area of a cube of dimensions  n×n×n is painted and it cut into n cubes of equal length (1 unit), then number of 2 faces painted cubes are