यदि \(a_n=n^2+2n-2\) है तो कौन-सा पद (79) के बराबर होगा?
If \(a_n=n^2+2n-2\) then which term is equal to (79)?
Explanation opens after your attempt
C. (n=9)
Concept
Putting (n=9) gives (97), while (n=8) gives (78), so none of the options is correct. In exams check options by direct substitution.
Why this answer is correct
The correct answer is C. (n=9). Putting (n=9) gives (97), while (n=8) gives (78), so none of the options is correct. In exams check options by direct substitution.
Exam Tip
\(9^2+18-2=97\) नहीं बल्कि (n=8) पर (78) और (n=9) पर (97) मिलता है इसलिए कोई विकल्प सही नहीं है। परीक्षा में विकल्पों को सीधे रखकर जाँचें।
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