यदि (a_n=\frac{n(n+1)}{2}) है, तो \(a_6\) का मान क्या होगा?
If (a_n=\frac{n(n+1)}{2}), what is the value of \(a_6\)?
Explanation opens after your attempt
A. (21)
Concept
\(a_6=\frac{6\times7}{2}=21\). In exams, multiply first and then divide by (2).
Why this answer is correct
The correct answer is A. (21). \(a_6=\frac{6\times7}{2}=21\). In exams, multiply first and then divide by (2).
Exam Tip
\(a_6=\frac{6\times7}{2}=21\) है। परीक्षा में गुणन के बाद (2) से भाग दें।
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