यदि \(a_1=2\), \(a_2=3\) और \(a_n=a_{n-1}+2a_{n-2}+n\) है तो \(a_4\) क्या होगा?
If \(a_1=2\), \(a_2=3\), and \(a_n=a_{n-1}+2a_{n-2}+n\), what is \(a_4\)?
Explanation opens after your attempt
C. (20)
Concept
\(a_3=3+2\times2+3=10\) and \(a_4=10+2\times3+4=20\). Exam tip: do not forget to add the current (n).
Why this answer is correct
The correct answer is C. (20). \(a_3=3+2\times2+3=10\) and \(a_4=10+2\times3+4=20\). Exam tip: do not forget to add the current (n).
Exam Tip
\(a_3=3+2\times2+3=10\) और \(a_4=10+2\times3+4=20\) है। वर्तमान (n) भी जोड़ना न भूलें।
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