यदि \(a_1=2\), \(a_2=4\) और \(a_n=a_{n-1}+a_{n-2}+3n\) है तो \(a_5\) क्या होगा?
If \(a_1=2\), \(a_2=4\), and \(a_n=a_{n-1}+a_{n-2}+3n\), what is \(a_5\)?
Explanation opens after your attempt
D. (61)
Concept
The terms are (2,4,15,31,61), so \(a_5=61\). Exam tip: add current (3n) with the previous two terms.
Why this answer is correct
The correct answer is D. (61). The terms are (2,4,15,31,61), so \(a_5=61\). Exam tip: add current (3n) with the previous two terms.
Exam Tip
पद (2,4,15,31,61) हैं इसलिए \(a_5=61\) है। पिछले दो पदों के साथ वर्तमान (3n) जोड़ें।
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