समांतर श्रेणी में \(a_5=30\) और (d=7) है। \(a_1\) क्या होगा?
In an arithmetic progression, \(a_5=30\) and (d=7). What is \(a_1\)?
Explanation opens after your attempt
A. (2)
Concept
\(a_5=a_1+4d\), so \(30=a_1+28\) and \(a_1=2\). To move backward from a given term subtract common differences.
Why this answer is correct
The correct answer is A. (2). \(a_5=a_1+4d\), so \(30=a_1+28\) and \(a_1=2\). To move backward from a given term subtract common differences.
Exam Tip
\(a_5=a_1+4d\), इसलिए \(30=a_1+28\) और \(a_1=2\)। दिए पद से पीछे जाने के लिए समान अंतर घटाएं।
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