यदि \(a_1=8\) और (a_{n+1}=a_n+2(-1)^n+n) है तो \(a_4\) क्या होगा?
If \(a_1=8\) and (a_{n+1}=a_n+2(-1)^n+n), what is \(a_4\)?
Explanation opens after your attempt
B. (11)
Concept
The terms are (8,7,11,12), so \(a_4=12\). Exam tip: track both the alternating sign part and (n).
Why this answer is correct
The correct answer is B. (11). The terms are (8,7,11,12), so \(a_4=12\). Exam tip: track both the alternating sign part and (n).
Exam Tip
पद (8,7,11,12) हैं इसलिए \(a_4=12\) है। चिह्न बदलने वाले भाग और (n) दोनों देखें।
Login to save your score, XP, coins and progress.
