समांतर श्रेणी में \(a_6=25\) और \(a_{11}=55\) है। \(a_1\) क्या है?
In an arithmetic progression, \(a_6=25\) and \(a_{11}=55\). What is \(a_1\)?
Explanation opens after your attempt
A. (-5)
Concept
\(a_{11}-a_6=5d=30\), so (d=6) and (a_1=25-5(6)=-5). First find (d), then move backward.
Why this answer is correct
The correct answer is A. (-5). \(a_{11}-a_6=5d=30\), so (d=6) and (a_1=25-5(6)=-5). First find (d), then move backward.
Exam Tip
\(a_{11}-a_6=5d=30\), इसलिए (d=6) और (a_1=25-5(6)=-5)। पहले (d) निकालकर पीछे जाएं।
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