यदि \(a_n=\frac{n^2+n}{2}\) है तो \(a_{18}\) का मान क्या होगा?
If \(a_n=\frac{n^2+n}{2}\), what will be the value of \(a_{18}\)?
Explanation opens after your attempt
B. (171)
Concept
\(a_{18}=\frac{18^2+18}{2}=\frac{342}{2}=171\). Exam tip: simplify the numerator first in fractions.
Why this answer is correct
The correct answer is B. (171). \(a_{18}=\frac{18^2+18}{2}=\frac{342}{2}=171\). Exam tip: simplify the numerator first in fractions.
Exam Tip
\(a_{18}=\frac{18^2+18}{2}=\frac{342}{2}=171\) है। भिन्न में पहले अंश सरल करें।
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