किसी अनुक्रम में \(a_1=3\) और \(a_n=2a_{n-1}+n+1\) है। \(a_4\) का मान क्या होगा?
In a sequence, \(a_1=3\) and \(a_n=2a_{n-1}+n+1\). What is the value of \(a_4\)?
Explanation opens after your attempt
C. उनचास(49)
Concept
We get \(a_2=9\), \(a_3=22\), and \(a_4=49\). In exams, keep the current value of (n) correct.
Why this answer is correct
The correct answer is C. उनचास / (49). We get \(a_2=9\), \(a_3=22\), and \(a_4=49\). In exams, keep the current value of (n) correct.
Exam Tip
\(a_2=9\), \(a_3=22\) और \(a_4=49\) मिलता है। परीक्षा में (n) का वर्तमान मान सही रखें।
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