खालीलपैकी कोणती संख्या पूर्ण घन नाही?
A64
B243
C216
D1728
Answer & Solution
Correct answer: B. 243
1. 64 = 4³, 216 = 6³ आणि 1728 = 12³, या सर्व पूर्ण घन संख्या आहेत.
2. 243 साठी, लक्षात घ्या की 6³ = 216 आणि 7³ = 343, त्यामुळे 243 ही दोन लगतच्या घनांच्या दरम्यान येते.
3. म्हणून 243 ही पूर्ण घन संख्या नाही (ती प्रत्यक्षात 3⁵ आहे).
_Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.40._
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