यदि \(a_1=3\) और (a_{n+1}=a_n+\frac{n(n+1)}{2}) है तो \(a_5\) क्या होगा?
If \(a_1=3\) and (a_{n+1}=a_n+\frac{n(n+1)}{2}), what is \(a_5\)?
Explanation opens after your attempt
Correct Answer
B. (23)
Concept
The terms are (3,4,7,13,23), so \(a_5=23\). Exam tip: add triangular increments (1,3,6,10) in order.
Why this answer is correct
The correct answer is B. (23). The terms are (3,4,7,13,23), so \(a_5=23\). Exam tip: add triangular increments (1,3,6,10) in order.
Exam Tip
पद (3,4,7,13,23) हैं इसलिए \(a_5=23\) है। त्रिभुजीय जोड़ (1,3,6,10) क्रम से जोड़ें।
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