यदि \(S_n=6n^2+2n\) है तो इस समान्तर श्रेणी का (a+d) कितना होगा?
If \(S_n=6n^2+2n\), what is (a+d) for this arithmetic progression?
Explanation opens after your attempt
D. (20)
Concept
\(a=S_1=8\) and \(a_2=S_2-S_1=20\), so (d=12) and (a+d=20). Exam tip: find \(S_1\) and \(S_2-S_1\).
Why this answer is correct
The correct answer is D. (20). \(a=S_1=8\) and \(a_2=S_2-S_1=20\), so (d=12) and (a+d=20). Exam tip: find \(S_1\) and \(S_2-S_1\).
Exam Tip
\(a=S_1=8\) और \(a_2=S_2-S_1=20\) है इसलिए (d=12) और (a+d=20)। परीक्षा में \(S_1\) और \(S_2-S_1\) निकालें।
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