यदि \(a_1=1\), \(a_2=3\) और \(a_n=2a_{n-1}+a_{n-2}\) है तो \(a_4\) क्या होगा?
If \(a_1=1\), \(a_2=3\), and \(a_n=2a_{n-1}+a_{n-2}\), what is \(a_4\)?
Explanation opens after your attempt
C. (17)
Concept
The terms are (1,3,7,17), so \(a_4=17\). Exam tip: multiply \(a_{n-1}\) by (2) in this two-term rule.
Why this answer is correct
The correct answer is C. (17). The terms are (1,3,7,17), so \(a_4=17\). Exam tip: multiply \(a_{n-1}\) by (2) in this two-term rule.
Exam Tip
पद (1,3,7,17) हैं इसलिए \(a_4=17\) है। दो-पद नियम में \(a_{n-1}\) को (2) से गुणा करें।
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