यदि समांतर श्रेणी में \(a_5=28\) और (d=7) है, तो पहला पद \(a_1\) क्या होगा?
If an arithmetic progression has \(a_5=28\) and (d=7), what is the first term \(a_1\)?
Explanation opens after your attempt
A. (0)
Concept
\(a_5=a_1+4d\), so \(28=a_1+28\) and \(a_1=0\). To move backward from a given term, subtract common differences.
Why this answer is correct
The correct answer is A. (0). \(a_5=a_1+4d\), so \(28=a_1+28\) and \(a_1=0\). To move backward from a given term, subtract common differences.
Exam Tip
\(a_5=a_1+4d\), इसलिए \(28=a_1+28\) और \(a_1=0\)। दिए पद से पीछे जाने के लिए समान अंतर घटाएं।
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