A hollow cube of size 5 cm is taken, with a thickness of 1 cm. It is made of smaller cubes of size 1 cm. If 4 faces of the outer surface of the cube are painted, totally how many faces of the smaller cubes remain unpainted?
800
500
488
900

• The outside of the large cube = 5cm,The inside space = 3cm
  Total number of small cubes =(5*5*5) - (3*3*3)=98each cube has 6 faces
  total number of small cube faces = 6*(98)=588
  Each face of the large cube has 5 * 5 faces of the smaller cubes = 25
  4 faces of the large cube are painted = 100 small cube faces
  588-100=488 unpainted smaller vubes
  
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