यदि \(a_1=90\) और (a_{n+1}=a_n-\frac{n(n+3)}{2}) है तो \(a_4\) क्या होगा?
If \(a_1=90\) and (a_{n+1}=a_n-\frac{n(n+3)}{2}), what is \(a_4\)?
Explanation opens after your attempt
C. (74)
Concept
The subtracted values are (2,5,9), so \(a_4=74\). Exam tip: simplify the fraction before subtracting.
Why this answer is correct
The correct answer is C. (74). The subtracted values are (2,5,9), so \(a_4=74\). Exam tip: simplify the fraction before subtracting.
Exam Tip
घटने वाले मान (2,5,9) हैं इसलिए \(a_4=74\) है। भिन्न को सरल करके घटाएँ।
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