All the faces of a cube are painted with blue colour. Then it is cut into 125 small equal cubes.

How many small cubes will be formed having only one face coloured ?

A. 54 B. 8
C. 16 D. 24

• no.of small cubes will have only one face painted=(X-2)2*6
  Here x=side of the small cube=5
  therfore(X-2)2*6=54
• 13 years agoHelpfull: Yes(8) No(0)
• there is a formula,
  for no sides painted=(n-3)^3
  for one side painted=6(n-2)^2
  
  here n=5 because 5^3=125 therefore n=5
  and hence 6(5-2)^2=6(3)^2
  6*9=54
  
• 13 years agoHelpfull: Yes(8) No(1)