यदि किसी समांतर श्रेणी में \(a_3=11\) और (d=5) है, तो पहला पद \(a_1\) क्या होगा?
If an arithmetic progression has \(a_3=11\) and (d=5), what is the first term \(a_1\)?
Explanation opens after your attempt
A. (1)
Concept
\(a_3=a_1+2d\), so \(11=a_1+10\) and \(a_1=1\). When moving backward subtract the common difference.
Why this answer is correct
The correct answer is A. (1). \(a_3=a_1+2d\), so \(11=a_1+10\) and \(a_1=1\). When moving backward subtract the common difference.
Exam Tip
\(a_3=a_1+2d\), इसलिए \(11=a_1+10\) और \(a_1=1\)। पीछे जाते समय समान अंतर घटाएं।
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