यदि \(a_1=1\) और \(a_{n+1}=a_n+n^2+3n\) है तो \(a_5\) क्या होगा?
If \(a_1=1\) and \(a_{n+1}=a_n+n^2+3n\), what is \(a_5\)?
Explanation opens after your attempt
A. (61)
Concept
The added values are (4,10,18,28), so \(a_5=61\). Exam tip: first find the values of \(n^2+3n\).
Why this answer is correct
The correct answer is A. (61). The added values are (4,10,18,28), so \(a_5=61\). Exam tip: first find the values of \(n^2+3n\).
Exam Tip
जुड़ने वाले मान (4,10,18,28) हैं इसलिए \(a_5=61\) है। पहले \(n^2+3n\) के मान अलग निकालें।
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