यदि \(a_1=12\) और (a_{n+1}=a_n+(-1)^n(3n+1)) है तो \(a_5\) क्या होगा?
If \(a_1=12\) and (a_{n+1}=a_n+(-1)^n(3n+1)), what is \(a_5\)?
Explanation opens after your attempt
C. (8)
Concept
The terms are (12,8,15,5,18), so \(a_5=18\). Exam tip: track the alternating sign carefully.
Why this answer is correct
The correct answer is C. (8). The terms are (12,8,15,5,18), so \(a_5=18\). Exam tip: track the alternating sign carefully.
Exam Tip
पद (12,8,15,5,18) हैं इसलिए \(a_5=18\) है। सही विकल्पों में (18) होना चाहिए।
Login to save your score, XP, coins and progress.
