यदि \(a_1=5\) और (a_{n+1}=2a_n+(-1)^n) है तो \(a_4\) क्या होगा?
If \(a_1=5\) and (a_{n+1}=2a_n+(-1)^n), what is \(a_4\)?
Explanation opens after your attempt
C. (37)
Concept
The terms are (5,9,19,37), so \(a_4=37\). Exam tip: check the sign of ((-1)^n) at each step.
Why this answer is correct
The correct answer is C. (37). The terms are (5,9,19,37), so \(a_4=37\). Exam tip: check the sign of ((-1)^n) at each step.
Exam Tip
पद (5,9,19,37) हैं इसलिए \(a_4=37\) है। ((-1)^n) का चिह्न हर चरण में जाँचें।
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