यदि \(a_1=100\) और (a_{n+1}=a_n-n(n+2)) है तो \(a_4\) क्या होगा?
If \(a_1=100\) and (a_{n+1}=a_n-n(n+2)), what is \(a_4\)?
Explanation opens after your attempt
A. (74)
Concept
The terms are (100,97,89,74), so \(a_4=74\). Exam tip: subtract (3,8,15) in order.
Why this answer is correct
The correct answer is A. (74). The terms are (100,97,89,74), so \(a_4=74\). Exam tip: subtract (3,8,15) in order.
Exam Tip
पद (100,97,89,74) हैं इसलिए \(a_4=74\) है। (3,8,15) को क्रम से घटाएँ।
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