यदि \(a_1=120\) और (a_{n+1}=a_n-\(n^2+n\)) है तो \(a_5\) क्या होगा?
If \(a_1=120\) and (a_{n+1}=a_n-\(n^2+n\)), what is \(a_5\)?
Explanation opens after your attempt
B. (80)
Concept
The subtracted values are (2,6,12,20), so (120-40=80). Exam tip: list changing subtractions in order.
Why this answer is correct
The correct answer is B. (80). The subtracted values are (2,6,12,20), so (120-40=80). Exam tip: list changing subtractions in order.
Exam Tip
घटने वाले मान (2,6,12,20) हैं इसलिए (120-40=80) है। बदलते घटावों को क्रम से लिखें।
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