यदि किसी समानांतर श्रेढ़ी में \(a_2=13\) और (d=4) है, तो \(a_1\) क्या होगा?
If an arithmetic progression has \(a_2=13\) and (d=4), what is \(a_1\)?
Explanation opens after your attempt
D. (9)
Concept
\(a_2=a_1+d\), so \(a_1=13-4=9\). If the second term is given, move one common difference backward.
Why this answer is correct
The correct answer is D. (9). \(a_2=a_1+d\), so \(a_1=13-4=9\). If the second term is given, move one common difference backward.
Exam Tip
\(a_2=a_1+d\), इसलिए \(a_1=13-4=9\)। दूसरा पद दिया हो तो एक समान अंतर पीछे जाएं।
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