यदि \(a_1=2\), \(a_2=6\) और \(a_n=a_{n-1}+2a_{n-2}+n^2\) है तो \(a_4\) क्या होगा?
If \(a_1=2\), \(a_2=6\), and \(a_n=a_{n-1}+2a_{n-2}+n^2\), what is \(a_4\)?
Explanation opens after your attempt
C. (47)
Concept
\(a_3=19\) and \(a_4=47\). Exam tip: also add \(n^2\) in the two-term rule.
Why this answer is correct
The correct answer is C. (47). \(a_3=19\) and \(a_4=47\). Exam tip: also add \(n^2\) in the two-term rule.
Exam Tip
\(a_3=19\) और \(a_4=47\) है। दो-पद नियम में \(n^2\) भी जोड़ें।
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