यदि (a_n=\frac{n(2n+1)}{3}) है तो \(a_4\) का मान क्या होगा?
If (a_n=\frac{n(2n+1)}{3}) then what is the value of \(a_4\)?
Explanation opens after your attempt
C. (12)
Concept
\(a_4=\frac{4\times9}{3}=12\). In exams multiply first and then divide by (3).
Why this answer is correct
The correct answer is C. (12). \(a_4=\frac{4\times9}{3}=12\). In exams multiply first and then divide by (3).
Exam Tip
\(a_4=\frac{4\times9}{3}=12\) है। परीक्षा में पहले गुणन करें फिर (3) से भाग दें।
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