यदि \(a_1=3\) और (a_{n+1}=a_n+n(n+1)) है तो \(a_4\) क्या होगा?
If \(a_1=3\) and (a_{n+1}=a_n+n(n+1)), what is \(a_4\)?
Explanation opens after your attempt
D. (23)
Concept
The terms are (3,5,11,23), so \(a_4=23\). Exam tip: (n(n+1)) gives (2,6,12).
Why this answer is correct
The correct answer is D. (23). The terms are (3,5,11,23), so \(a_4=23\). Exam tip: (n(n+1)) gives (2,6,12).
Exam Tip
पद (3,5,11,23) हैं इसलिए \(a_4=23\) है। (n(n+1)) का मान (2,6,12) बनता है।
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