RRB Group D practice question
A cube of side 9 cm is painted on all its outer surfaces and then cut into 729 smaller cubes of side 1 cm each. How many of these smaller cubes have exactly 1 face painted?
From a RRB Group D Reasoning practice set · Reasoning
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Correct answer: (A) 294
Face-center cubes (1 face painted) = 6 × (n-2)² = 6 × 7² = 294.
हिंदी में प्रश्न
9 सेमी भुजा वाले एक घन के सभी बाहरी पृष्ठों को रंगा गया और फिर इसे 1 सेमी भुजा वाले 729 छोटे घनों में काटा गया। इनमें से कितने छोटे घनों के ठीक 1 फलक रंगा हुआ हैं?
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सही उत्तर: (A) 294
Face-center cubes (1 face painted) = 6 × (n-2)² = 6 × 7² = 294.
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