यदि \(a_1=5\) और (a_{n+1}=a_n+(-1)^n) है तो \(a_5\) क्या होगा?
If \(a_1=5\) and (a_{n+1}=a_n+(-1)^n), what is \(a_5\)?
Explanation opens after your attempt
C. (5)
Concept
The terms are (5,4,5,4,5), so \(a_5=5\). Exam tip: the sign of ((-1)^n) changes with even and odd (n).
Why this answer is correct
The correct answer is C. (5). The terms are (5,4,5,4,5), so \(a_5=5\). Exam tip: the sign of ((-1)^n) changes with even and odd (n).
Exam Tip
पद (5,4,5,4,5) हैं इसलिए \(a_5=5\) है। ((-1)^n) में सम और विषम (n) का चिह्न बदलता है।
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