All surfaces of a cube are colored. If a number of smaller cubes are taken out from it, each side 1/4th the size of the original cube's side, indicate the number of cubes with only one side painted. 

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SJVN ET Mechanical 2019 Official Paper
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  1. 18
  2. 20
  3. 16
  4. 24

Answer (Detailed Solution Below)

Option 4 : 24
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Detailed Solution

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Given, each side 1/4th the size of the original cube's side

Each face of the cube will look like the figure below:
quesImage4962
On each face, the smaller cubes that don't lie on the edges of the bigger cube will have only one side painted.

As shown in the figure above, there are four cubes which has only one face painted.

Accordingly, there will be 6 such faces of bigger cube.

Then, small cubes hane one side painted is,

⇒ 6 × 4 = 24

So, total 24 small cubes have one painted face.

Hence, the correct answer is "Option 4".

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