यदि \(a_5=18\) और \(a_{14}=81\) है, तो \(a_1\) क्या होगा?
If \(a_5=18\) and \(a_{14}=81\), what is \(a_1\)?
Explanation opens after your attempt
A. (-10)
Concept
\(a_{14}-a_5=9d=63\), so (d=7) and (a_1=18-4(7)=-10). Find the common difference first.
Why this answer is correct
The correct answer is A. (-10). \(a_{14}-a_5=9d=63\), so (d=7) and (a_1=18-4(7)=-10). Find the common difference first.
Exam Tip
\(a_{14}-a_5=9d=63\), इसलिए (d=7) और (a_1=18-4(7)=-10)। पहले समान अंतर निकालें।
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