यदि \(a_1=15\) और \(a_{n+1}=a_n-n\) है तो \(a_4\) क्या होगा?
If \(a_1=15\) and \(a_{n+1}=a_n-n\), what is \(a_4\)?
Explanation opens after your attempt
C. (9)
Concept
The terms are (15,14,12,9), so \(a_4=9\). Exam tip: subtract (n) in the order (1,2,3).
Why this answer is correct
The correct answer is C. (9). The terms are (15,14,12,9), so \(a_4=9\). Exam tip: subtract (n) in the order (1,2,3).
Exam Tip
पद (15,14,12,9) हैं इसलिए \(a_4=9\) है। (n) को (1,2,3) के क्रम में घटाएँ।
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