यदि \(a_n=4\cdot3^{n-1}\) है तो (2916) कौन-सा पद होगा?
If \(a_n=4\cdot3^{n-1}\) which term will be (2916)?
Explanation opens after your attempt
Correct Answer
B. सातवाँ पद(7)th term
Concept
From \(4\cdot3^{n-1}=2916\), \(3^{n-1}=729=3^6\) so (n=7). In exams first equate the given term to \(a_n\).
Why this answer is correct
The correct answer is B. सातवाँ पद / (7)th term. From \(4\cdot3^{n-1}=2916\), \(3^{n-1}=729=3^6\) so (n=7). In exams first equate the given term to \(a_n\).
Exam Tip
\(4\cdot3^{n-1}=2916\) से \(3^{n-1}=729=3^6\) इसलिए (n=7) है। परीक्षा में पहले दिए पद को \(a_n\) के बराबर रखें।
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