यदि \(a_1=3\) और \(a_{n+1}=2a_n+n+1\) है तो \(a_4\) का मान क्या होगा?
If \(a_1=3\) and \(a_{n+1}=2a_n+n+1\), what is the value of \(a_4\)?
Explanation opens after your attempt
Correct Answer
C. (43)
Concept
The terms are (3,8,20,43), so \(a_4=43\). Exam tip: double the previous term first and then add (n+1).
Why this answer is correct
The correct answer is C. (43). The terms are (3,8,20,43), so \(a_4=43\). Exam tip: double the previous term first and then add (n+1).
Exam Tip
पद (3,8,20,43) हैं इसलिए \(a_4=43\) है। पहले पिछले पद को दोगुना करें फिर (n+1) जोड़ें।
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