यदि \(a_1=1\) और \(a_{n+1}=a_n+3^n\) है तो \(a_4\) क्या होगा?
If \(a_1=1\) and \(a_{n+1}=a_n+3^n\), what is \(a_4\)?
Explanation opens after your attempt
D. (40)
Concept
The terms are (1,4,13,40), so \(a_4=40\). Exam tip: add (3,9,27), the values of \(3^n\).
Why this answer is correct
The correct answer is D. (40). The terms are (1,4,13,40), so \(a_4=40\). Exam tip: add (3,9,27), the values of \(3^n\).
Exam Tip
पद (1,4,13,40) हैं इसलिए \(a_4=40\) है। \(3^n\) के मान (3,9,27) जोड़ें।
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