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Q.

A cube, painted yellow on all faces is cut into 27 small cubes of equal size. How many small cubes are painted on one face only ?

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a

1

b

6

c

8

d

12

answer is B.

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Detailed Solution

Only one face painted cubes $= 6 {(n - 2)}^{2}$

$\begin{array}{l} = 6 {(3 - 2)}^{2} \\ = 6 {(1)}^{2} = 6 \end{array}$

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