यदि \(a_n=n^3-1\) है तो कौन-सा पद (124) के बराबर होगा?
If \(a_n=n^3-1\) then which term is equal to (124)?
Explanation opens after your attempt
B. (n=5)
Concept
From \(n^3-1=124\) we get \(n^3=125\) and (n=5). In exams recognize cube numbers.
Why this answer is correct
The correct answer is B. (n=5). From \(n^3-1=124\) we get \(n^3=125\) and (n=5). In exams recognize cube numbers.
Exam Tip
\(n^3-1=124\) से \(n^3=125\) और (n=5) है। परीक्षा में घन संख्या पहचानें।
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