alleryনিচের কোন সংখ্যাটি পূর্ণঘন সংখ্যা নয়?
A64
B243
C216
D1728
Answer & Solution
Correct answer: B. 243
1. 64 = 4³, 216 = 6³ এবং 1728 = 12³, এগুলি সবই পূর্ণঘন সংখ্যা।
2. 243-এর ক্ষেত্রে, লক্ষ্য করুন 6³ = 216 এবং 7³ = 343, তাই 243 দুটি পরপর ঘনসংখ্যার মাঝে অবস্থিত।
3. অতএব 243 একটি পূর্ণঘন সংখ্যা নয় (এটি প্রকৃতপক্ষে 3⁵)।
_উৎস: RRB Group D (RRC) PYQ, অনুষ্ঠিত 27-10-2013, Q.40._
Keep practising Number System
Browse all Number System questions for RRB NTPC, or explore more Quantitative Aptitude topics.
Related questions
For rational numbers a/b and c/d with strictly positive denominators, a/b < c/d holds precThe fundamental theorem of arithmetic guarantees that prime factorization of an integer isIf the 7-digit number 5432y71 is divisible by 9, what is the single-digit value of y?Under the ancient rules formulated by Brahmagupta, subtracting zero from a fortune resultsWhich celebrated 6-digit recurring sequence forms the cyclic repeating block in decimal 1/In number theory, what specific technical name is given to the property of being a prime nWhen does long division of a rational fraction terminate?How many rational numbers lie between any two rational points?