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How many small cubes are there whose two adjacent faces are coloured red ?

A

0

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B

8

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C

16

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D

24

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Solution

The correct option is C 24
There are 64 small cubes.
Hence one side of the big cube $= \sqrt[3]{64} = 4 c m$ .
Number of small cubes having two adjacent faces coloured red = (x - 2) x No. of edges
= (4 - 2) x 12
= 24

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