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?

A. 900
B. 563
C. 488
D. 592


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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