यदि \(a_1=120\) और (a_{n+1}=a_n-n(n+3)) है तो \(a_4\) क्या होगा?
If \(a_1=120\) and (a_{n+1}=a_n-n(n+3)), what is \(a_4\)?
Explanation opens after your attempt
A. (88)
Concept
The terms are (120,116,106,88), so \(a_4=88\). Exam tip: subtract (4,10,18) in order.
Why this answer is correct
The correct answer is A. (88). The terms are (120,116,106,88), so \(a_4=88\). Exam tip: subtract (4,10,18) in order.
Exam Tip
पद (120,116,106,88) हैं इसलिए \(a_4=88\) है। (4,10,18) को क्रम से घटाएँ।
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