यदि \(a_1=6\) और (a_{n+1}=a_n+(-1)^n(2n)) है तो \(a_5\) क्या होगा?
If \(a_1=6\) and (a_{n+1}=a_n+(-1)^n(2n)), what is \(a_5\)?
Explanation opens after your attempt
C. (6)
Concept
The terms are (6,4,8,2,10), so \(a_5=10\). Exam tip: check even and odd (n) in sign-changing rules.
Why this answer is correct
The correct answer is C. (6). The terms are (6,4,8,2,10), so \(a_5=10\). Exam tip: check even and odd (n) in sign-changing rules.
Exam Tip
पद (6,4,8,2,10) नहीं बल्कि \(a_5=10\) है। चिह्न बदलने वाले पदों में सम-विषम (n) जाँचें।
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