A cuboid of dimensions (6 cm x 4 cm x1 cm) is painted black on both the
surfaces of dimensions (4 cm x1 cm), green on the surfaces of dimensions (6 cm x 4 cm) and red on the
surfaces of dimensions (6 cm x1 cm). Now the block is divided into various smaller cubes of side 1 cm each.
The smaller cubes so obtained are separated. How many cubes will formed?
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Answer:
Number of smaller cubes having all three colours black, green and red
each atleast on one side = Number of smaller cubes at 4 corners +
Number of smaller cubes at the 2 edges of surfaces of dimensions
(4cm×1cm) + Number of smaller cubes at the 2 edges of
surfaces of dimensions (6cm×1cm)
=4+2+2+4+4=4+4+8=16
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