यदि \(a_1=10\) और (a_{n+1}=a_n+(-1)^{n+1}(n+2)) है तो \(a_5\) क्या होगा?
If \(a_1=10\) and (a_{n+1}=a_n+(-1)^{n+1}(n+2)), what is \(a_5\)?
Explanation opens after your attempt
B. (8)
Concept
The terms are (10,13,9,14,8), so \(a_5=8\). Exam tip: check the sign at each step in alternating rules.
Why this answer is correct
The correct answer is B. (8). The terms are (10,13,9,14,8), so \(a_5=8\). Exam tip: check the sign at each step in alternating rules.
Exam Tip
पद (10,13,9,14,8) हैं इसलिए \(a_5=8\) है। चिह्न बदलने वाले नियम में हर चरण का संकेत देखें।
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