alleryতলৰ কোনটো সংখ্যা এটা পূৰ্ণঘন সংখ্যা নহয়?
A64
B243
C216
D1728
Answer & Solution
Correct answer: B. 243
1. 64 = 4³, 216 = 6³ আৰু 1728 = 12³, এই সকলোবোৰ পূৰ্ণঘন সংখ্যা।
2. 243-ৰ বাবে লক্ষ্য কৰক যে 6³ = 216 আৰু 7³ = 343, গতিকে 243 দুটা ক্ৰমিক ঘন সংখ্যাৰ মাজত অৱস্থিত।
3. সেয়েহে 243 এটা পূৰ্ণঘন সংখ্যা নহয় (প্ৰকৃততে ই 3⁵)।
_Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.40._
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