यदि \(a_1=5\) और (a_{n+1}=a_n+(-1)^{n+1}n) है तो \(a_4\) क्या होगा?
If \(a_1=5\) and (a_{n+1}=a_n+(-1)^{n+1}n), what is \(a_4\)?
Explanation opens after your attempt
D. (7)
Concept
The terms are (5,6,4,7), so \(a_4=7\). Exam tip: check the sign of ((-1)^{n+1}) at each step.
Why this answer is correct
The correct answer is D. (7). The terms are (5,6,4,7), so \(a_4=7\). Exam tip: check the sign of ((-1)^{n+1}) at each step.
Exam Tip
पद (5,6,4,7) हैं इसलिए \(a_4=7\) है। ((-1)^{n+1}) के चिह्न को हर चरण में जाँचें।
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