यदि \(a_4=13\) और \(a_{13}=67\) है, तो \(a_1\) क्या होगा?
If \(a_4=13\) and \(a_{13}=67\), what is \(a_1\)?
Explanation opens after your attempt
A. (-5)
Concept
\(a_{13}-a_4=9d=54\), so (d=6) and (a_1=13-3(6)=-5). Find the common difference first.
Why this answer is correct
The correct answer is A. (-5). \(a_{13}-a_4=9d=54\), so (d=6) and (a_1=13-3(6)=-5). Find the common difference first.
Exam Tip
\(a_{13}-a_4=9d=54\), इसलिए (d=6) और (a_1=13-3(6)=-5)। पहले समान अंतर निकालें।
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