यदि \(a_1=1\) और \(a_{n+1}=a_n+n^2+n\) है तो \(a_4\) क्या होगा?
If \(a_1=1\) and \(a_{n+1}=a_n+n^2+n\), what is \(a_4\)?
Explanation opens after your attempt
C. (23)
Concept
The terms are (1,3,9,21), so \(a_4=21\). The values of \(n^2+n\) are (2,6,12).
Why this answer is correct
The correct answer is C. (23). The terms are (1,3,9,21), so \(a_4=21\). The values of \(n^2+n\) are (2,6,12).
Exam Tip
पद (1,3,9,21) नहीं बल्कि \(a_4=21\) है। \(n^2+n\) के मान (2,6,12) हैं।
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