यदि \(a_1=2\), \(a_2=5\) और \(a_n=a_{n-1}+2a_{n-2}\) है तो \(a_4\) क्या होगा?
If \(a_1=2\), \(a_2=5\), and \(a_n=a_{n-1}+2a_{n-2}\), what is \(a_4\)?
Explanation opens after your attempt
B. (19)
Concept
\(a_3=5+2\times2=9\) and \(a_4=9+2\times5=19\). Exam tip: write positions while using two-term rules.
Why this answer is correct
The correct answer is B. (19). \(a_3=5+2\times2=9\) and \(a_4=9+2\times5=19\). Exam tip: write positions while using two-term rules.
Exam Tip
\(a_3=5+2\times2=9\) और \(a_4=9+2\times5=19\) है। दो-पद नियम में क्रमांक साथ लिखें।
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