यदि \(a_1=6\) और (a_{n+1}=a_n+(-1)^n(2n)) है तो \(a_4\) क्या होगा?
If \(a_1=6\) and (a_{n+1}=a_n+(-1)^n(2n)), what is \(a_4\)?
Explanation opens after your attempt
A. (2)
Concept
The terms are (6,4,8,2), so \(a_4=2\). Exam tip: the sign of ((-1)^n) changes at each step.
Why this answer is correct
The correct answer is A. (2). The terms are (6,4,8,2), so \(a_4=2\). Exam tip: the sign of ((-1)^n) changes at each step.
Exam Tip
पद (6,4,8,2) हैं इसलिए \(a_4=2\) है। ((-1)^n) का चिह्न हर चरण में बदलता है।
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