यदि \(a_1=2\), \(a_2=5\) और \(a_n=2a_{n-1}+a_{n-2}+n\) है तो \(a_4\) क्या होगा?
If \(a_1=2\), \(a_2=5\), and \(a_n=2a_{n-1}+a_{n-2}+n\), what is \(a_4\)?
Explanation opens after your attempt
C. (39)
Concept
\(a_3=2\times5+2+3=15\) and \(a_4=2\times15+5+4=39\). Exam tip: add the current (n) also in a two-term rule.
Why this answer is correct
The correct answer is C. (39). \(a_3=2\times5+2+3=15\) and \(a_4=2\times15+5+4=39\). Exam tip: add the current (n) also in a two-term rule.
Exam Tip
\(a_3=2\times5+2+3=15\) और \(a_4=2\times15+5+4=39\) है। दो-पद नियम में वर्तमान (n) भी जोड़ें।
Login to save your score, XP, coins and progress.
