यदि \(a_1=2\), \(a_2=5\) और \(a_n=2a_{n-1}+a_{n-2}+2n\) है तो \(a_5\) क्या होगा?
If \(a_1=2\), \(a_2=5\), and \(a_n=2a_{n-1}+a_{n-2}+2n\), what is \(a_5\)?
Explanation opens after your attempt
D. (126)
Concept
The terms are (2,5,18,49,126), so \(a_5=126\). Exam tip: add the current (2n) at each step.
Why this answer is correct
The correct answer is D. (126). The terms are (2,5,18,49,126), so \(a_5=126\). Exam tip: add the current (2n) at each step.
Exam Tip
पद (2,5,18,49,126) हैं इसलिए \(a_5=126\) है। वर्तमान (2n) को हर चरण में जोड़ें।
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