यदि \(a_1=100\) और (a_{n+1}=a_n-\(2n^2+n\)) है तो \(a_4\) क्या होगा?
If \(a_1=100\) and (a_{n+1}=a_n-\(2n^2+n\)), what is \(a_4\)?
Explanation opens after your attempt
D. (69)
Concept
The subtracted values are (3,10,21), so \(a_4=66\). Exam tip: add all subtractions first and then subtract.
Why this answer is correct
The correct answer is D. (69). The subtracted values are (3,10,21), so \(a_4=66\). Exam tip: add all subtractions first and then subtract.
Exam Tip
घटने वाले मान (3,10,21) हैं इसलिए \(a_4=66\) नहीं बल्कि (66) होगा। सही गणना में सभी घटाव जोड़कर घटाएँ।
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