यदि समानांतर श्रेढ़ी में \(a_4=18\) और (d=3) है, तो \(a_9\) क्या होगा?
If an arithmetic progression has \(a_4=18\) and (d=3), what will be \(a_9\)?
Explanation opens after your attempt
D. (33)
Concept
From \(a_4\) to \(a_9\), there are (5) gaps, so (a_9=18+5(3)=33). Moving forward from a nearby term is a quick method.
Why this answer is correct
The correct answer is D. (33). From \(a_4\) to \(a_9\), there are (5) gaps, so (a_9=18+5(3)=33). Moving forward from a nearby term is a quick method.
Exam Tip
\(a_9\) तक \(a_4\) से (5) अंतर आगे हैं, इसलिए (a_9=18+5(3)=33)। पास के पद से आगे बढ़ना तेज तरीका है।
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