यदि \(a_n=n^2+n-2\) है तो कौन-सा पद (70) के बराबर होगा?
If \(a_n=n^2+n-2\) then which term is equal to (70)?
Explanation opens after your attempt
B. (n=8)
Concept
\(8^2+8-2=70\) so (n=8). In exams you can check quickly by substituting options.
Why this answer is correct
The correct answer is B. (n=8). \(8^2+8-2=70\) so (n=8). In exams you can check quickly by substituting options.
Exam Tip
\(8^2+8-2=70\) है इसलिए (n=8) है। परीक्षा में विकल्प रखकर भी जल्दी जाँच सकते हैं।
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