यदि \(a_1=2\) और (a_{n+1}=a_n+\frac{n(n+1)}{2}+1) है तो \(a_5\) क्या होगा?
If \(a_1=2\) and (a_{n+1}=a_n+\frac{n(n+1)}{2}+1), what is \(a_5\)?
Explanation opens after your attempt
C. (28)
Concept
The terms are (2,4,8,15,26), so \(a_5=26\). Exam tip: add the increasing increments carefully.
Why this answer is correct
The correct answer is C. (28). The terms are (2,4,8,15,26), so \(a_5=26\). Exam tip: add the increasing increments carefully.
Exam Tip
पद (2,4,8,15,26) नहीं बल्कि \(a_5=26\) है। (2,4,7,11) जैसे बढ़ते जोड़ ध्यान से जोड़ें।
Login to save your score, XP, coins and progress.
