यदि \(a_1=2\), \(a_2=5\) और \(a_n=2a_{n-1}+a_{n-2}+n^2\) है तो \(a_4\) क्या होगा?
If \(a_1=2\), \(a_2=5\), and \(a_n=2a_{n-1}+a_{n-2}+n^2\), what is \(a_4\)?
Explanation opens after your attempt
A. (63)
Concept
\(a_3=21\) and \(a_4=63\). Exam tip: after applying coefficients, also add \(n^2\).
Why this answer is correct
The correct answer is A. (63). \(a_3=21\) and \(a_4=63\). Exam tip: after applying coefficients, also add \(n^2\).
Exam Tip
\(a_3=21\) और \(a_4=63\) है। गुणांक लगाने के बाद \(n^2\) भी जोड़ें।
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