यदि \(a_1=3\) और \(a_{n+1}=2a_n+2n+1\) है तो \(a_4\) क्या होगा?
If \(a_1=3\) and \(a_{n+1}=2a_n+2n+1\), what is \(a_4\)?
Explanation opens after your attempt
B. (49)
Concept
The terms are (3,9,23,53), so \(a_4=53\). The correct option should include (53).
Why this answer is correct
The correct answer is B. (49). The terms are (3,9,23,53), so \(a_4=53\). The correct option should include (53).
Exam Tip
पद (3,9,23,53) हैं इसलिए \(a_4=53\) है। सही विकल्प में (53) होना चाहिए।
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