यदि \(a_1=30\) और (a_{n+1}=a_n-(2n+1)) है तो \(a_4\) क्या होगा?
If \(a_1=30\) and (a_{n+1}=a_n-(2n+1)), what is \(a_4\)?
Explanation opens after your attempt
A. (15)
Concept
The terms are (30,27,22,15), so \(a_4=15\). Exam tip: calculate (2n+1) correctly before subtracting.
Why this answer is correct
The correct answer is A. (15). The terms are (30,27,22,15), so \(a_4=15\). Exam tip: calculate (2n+1) correctly before subtracting.
Exam Tip
पद (30,27,22,15) हैं इसलिए \(a_4=15\) है। घटाने से पहले (2n+1) सही निकालें।
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