यदि \(a_1=5\), \(a_2=9\) और \(a_n=a_{n-1}+a_{n-2}+4\) है तो \(a_4\) क्या होगा?
If \(a_1=5\), \(a_2=9\), and \(a_n=a_{n-1}+a_{n-2}+4\), what is \(a_4\)?
Explanation opens after your attempt
C. (31)
Concept
\(a_3=9+5+4=18\) and \(a_4=18+9+4=31\). Exam tip: add the extra (4) at each step.
Why this answer is correct
The correct answer is C. (31). \(a_3=9+5+4=18\) and \(a_4=18+9+4=31\). Exam tip: add the extra (4) at each step.
Exam Tip
\(a_3=9+5+4=18\) और \(a_4=18+9+4=31\) है। अतिरिक्त (4) हर चरण में जोड़ें।
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