1.

A solid cube of each side 10 cm, has been painted red, blue and black on pairs of opposite faces. It is then cut into cubical blocks of each side 2 cm. Answer the following questions. How many cubes have only one face painted red and all other faces unpainted?

Answer»

18
27
24
36

Solution :In this QUESTION X = 10 and x = 2
Such CUBES are
`1/3[6(10/2-2)^(2)]=1/3xx54=18`


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