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UPSC Prelims

CSAT Year Wise (Temporary Link, This will be removed and no PDFs shall be downloaded here. Please download CSAT subject wise files) / सी सैट

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CSAT 2023

Q18 2023, Cubes

125 identical cubes are arranged in the form of a cubical block. How many cubes are surrounded by other cubes from each side?

125 सर्वसम घन एक घनाकार खंड के रूप में व्यवस्थित किए गए हैं। कितने घन हर पार्श्व से अन्य घनों द्वारा घिरे हुए हैं?

Explanation Please wait..

We have to determine the quantity of internal cubes, which are cubes that are not visible from the outside.

Approach 2:

Total no of cubes = n³

number of internal cubes = (n - 2)³.

In the given question, n = 5.

Substituting n = 5 into the formula gives (5 - 2)³ = 3³ = 27.

Thus, the correct option is (a).

व्याख्या Please wait..

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