यदि (a_n=\frac{n(n+1)}{2}) है, तो छठा पद क्या होगा?
If (a_n=\frac{n(n+1)}{2}), what is the sixth term?
Explanation opens after your attempt
C. (21)
Concept
\(a_6=\frac{6\times7}{2}=21\). In exams, substitute the value of (n) first and simplify the fraction.
Why this answer is correct
The correct answer is C. (21). \(a_6=\frac{6\times7}{2}=21\). In exams, substitute the value of (n) first and simplify the fraction.
Exam Tip
\(a_6=\frac{6\times7}{2}=21\) है। परीक्षा में पहले (n) का मान रखकर भिन्न सरल करें।
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