यदि \(a_1=2\) और (a_{n+1}=a_n+n(n+2)) है तो \(a_4\) क्या होगा?
If \(a_1=2\) and (a_{n+1}=a_n+n(n+2)), what is \(a_4\)?
Explanation opens after your attempt
C. (26)
Concept
The terms are (2,5,13,28), so \(a_4=28\). Add the values (3,8,15) of (n(n+2)).
Why this answer is correct
The correct answer is C. (26). The terms are (2,5,13,28), so \(a_4=28\). Add the values (3,8,15) of (n(n+2)).
Exam Tip
पद (2,5,13,28) नहीं बल्कि \(a_4=28\) है। (n(n+2)) के मान (3,8,15) जोड़ें।
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