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Q.

A cube of side 10 cm is coloured red with a 2 cm wide green strip along all the sides on all the faces. The cube is cut into 125 smaller cubes of equal size. Answer the following questions based   on this statement :

 How many cubes are without any colour ?

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a

27

b

12

c

64

d

0

answer is B.

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Detailed Solution

Question Image

 

 

 

 

 

 

 

 

Cubes are unpainted = (n-2)3

=(5-2)3 =27

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