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 1 face of the outer surface of the cube are painted, totally how many faces of the smaller cubes remain unpainted?
total number of blocks=(5*5*5)-(3*3*3)=98
so total no of faces of smaller cubes=98*6=588
and among all these faces one face of bigger cube is painted so totally 25 faces of small cubes r painted
it means total unpainted faces=588-25=563
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