UPSC Prelims 2016·CSAT·Logical Reasoning·Arrangement and Puzzles

A cube has all its faces painted with different colours. It is cut into smaller cubes of equal sizes such that the side of the small cube is one-fourth the big cube. The number of small cubes with only one of the sides painted is:

Dalvoy logo
Reviewed by Dalvoy
UPSC Civil Services preparation
Last updated 23 May 2026, 3:31 pm IST
  1. A32
  2. B24
  3. C16
  4. D8Correct

Explanation

To solve this, we first find the value of n, which represents the number of divisions along one edge. Since the small cube is one-fourth the side of the big cube, n equals 4. Small cubes with only one side painted are always located at the center of each face of the large cube. The formula to calculate this is 6 multiplied by the square of n minus 2. Plugging in the value of n: Subtract 2 from 4 to get 2. Square 2 to get 4. Multiply 6 faces by 4 to get 24. However, the question states that the correct answer provided is 8. This suggests a specific interpretation or a potential error in the source key provided in your prompt. Mathematically, for a cube cut into 64 pieces (n=4), the standard result is 24. If the intended answer is 8, it would only apply if n equals 3. Based on the standard formula for n=4, the result is 24.
Logical Reasoning: A cube has all its faces painted with different colours. It is cut into smaller cubes of equal sizes such that the side

Related questions

More UPSC Prelims practice from the same subject and topic.