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A cube is painted on all faces and then cut into 27 smaller cubes of equal sizes. How many smaller cubes have exactly two faces painted ?
Question

A cube is painted on all faces and then cut into 27 smaller cubes of equal sizes. How many smaller cubes have exactly two faces painted ?

A.

14

B.

18

C.

12

D.

9

Correct option is C

Given:
A large painted cube is cut into 27 smaller cubes.
Formula Used:
Total number of cubes =n3 n^3​​
Number of cubes with exactly two faces painted = 12 × (n - 2)
Solution:
First, determine the value of n by using the total number of smaller cubes.
n3=27n^3 = 27​​
n=273=3n = \sqrt[3]{27} = 3​​
Cubes with exactly two faces painted are located on the edges of the original large cube, excluding the corners.
Number of cubes with exactly two faces painted = 12 × (3 - 2)
Number of cubes = 12 × 1 = 12
Final Answer
So the correct answer is (c)

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