यदि \(a_1=4\) और (a_{n+1}=2a_n+(-1)^n(2n+1)) है तो \(a_4\) क्या होगा?
If \(a_1=4\) and (a_{n+1}=2a_n+(-1)^n(2n+1)), what is \(a_4\)?
Explanation opens after your attempt
A. (23)
Concept
The terms are (4,5,15,23), so \(a_4=23\). Exam tip: double first and then add the signed part.
Why this answer is correct
The correct answer is A. (23). The terms are (4,5,15,23), so \(a_4=23\). Exam tip: double first and then add the signed part.
Exam Tip
पद (4,5,15,23) हैं इसलिए \(a_4=23\) है। दोगुना करने के बाद चिह्न वाला भाग जोड़ें।
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