यदि किसी समांतर श्रेणी में \(a_5+a_{13}=86\) है, तो \(a_9\) का मान क्या होगा?
If in an arithmetic progression \(a_5+a_{13}=86\), what is the value of \(a_9\)?
Explanation opens after your attempt
Correct Answer
C. (43)
Concept
\(a_9\) is equidistant from \(a_5\) and \(a_{13}\), so \(a_9=\frac{86}{2}=43\). The average of symmetric terms is the middle term.
Why this answer is correct
The correct answer is C. (43). \(a_9\) is equidistant from \(a_5\) and \(a_{13}\), so \(a_9=\frac{86}{2}=43\). The average of symmetric terms is the middle term.
Exam Tip
\(a_5\) और \(a_{13}\) से \(a_9\) समान दूरी पर है, इसलिए \(a_9=\frac{86}{2}=43\)। सममित पदों का औसत मध्य पद होता है।
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