समांतर श्रेणी में \(a_7=50\) और (d=9) है। \(a_1\) क्या होगा?
In an arithmetic progression, \(a_7=50\) and (d=9). What is \(a_1\)?
Explanation opens after your attempt
A. (-4)
Concept
\(a_7=a_1+6d\), so \(50=a_1+54\) and \(a_1=-4\). To move backward from a given term, subtract common differences.
Why this answer is correct
The correct answer is A. (-4). \(a_7=a_1+6d\), so \(50=a_1+54\) and \(a_1=-4\). To move backward from a given term, subtract common differences.
Exam Tip
\(a_7=a_1+6d\), इसलिए \(50=a_1+54\) और \(a_1=-4\)। दिए पद से पीछे जाने के लिए समान अंतर घटाएं।
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