यदि \(a_1=1\) और \(a_{n+1}=a_n+n^2+n\) है तो \(a_3\) क्या होगा?
If \(a_1=1\) and \(a_{n+1}=a_n+n^2+n\), what is \(a_3\)?
Explanation opens after your attempt
B. (9)
Concept
The terms are (1,3,9), so \(a_3=9\). Exam tip: calculate \(n^2+n\) correctly before adding.
Why this answer is correct
The correct answer is B. (9). The terms are (1,3,9), so \(a_3=9\). Exam tip: calculate \(n^2+n\) correctly before adding.
Exam Tip
पद (1,3,9) हैं इसलिए \(a_3=9\) है। \(n^2+n\) को जोड़ने से पहले सही निकालें।
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