यदि \(a_n=a_{n-1}+3n\) और \(a_4=31\) है, तो \(a_2\) का मान क्या होगा?
If \(a_n=a_{n-1}+3n\) and \(a_4=31\), what is the value of \(a_2\)?
Explanation opens after your attempt
A. दस(10)
Concept
\(a_4=a_2+9+12\), so \(a_2=10\). In exams, think backward for a middle term.
Why this answer is correct
The correct answer is A. दस / (10). \(a_4=a_2+9+12\), so \(a_2=10\). In exams, think backward for a middle term.
Exam Tip
\(a_4=a_2+9+12\), इसलिए \(a_2=10\) है। परीक्षा में बीच के पद के लिए उल्टी दिशा में सोचें।
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