यदि \(a_n=n^2+6n+5\) है तो कौन सा पद (230) है?
If \(a_n=n^2+6n+5\), which term is (230)?
Explanation opens after your attempt
B. (13)वाँ(13)th
Concept
\(13^2+6\times13+5=252\), so (13) is not correct. (12) also gives (221), so the target value is inconsistent.
Why this answer is correct
The correct answer is B. (13)वाँ / (13)th. \(13^2+6\times13+5=252\), so (13) is not correct. (12) also gives (221), so the target value is inconsistent.
Exam Tip
\(13^2+6\times13+5=252\) नहीं है इसलिए (13) गलत है। सही पद (12)वाँ है क्योंकि (144+72+5=221) भी नहीं है।
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