यदि \(a_n=8\cdot3^{n-1}\) है, तो \(a_n=1944\) के लिए (n) क्या होगा?
If \(a_n=8\cdot3^{n-1}\), what will (n) be for \(a_n=1944\)?
Explanation opens after your attempt
B. (6)
Concept
\(8\cdot3^{n-1}=1944\), so \(3^{n-1}=243=3^5\) and (n=6). Compare powers.
Why this answer is correct
The correct answer is B. (6). \(8\cdot3^{n-1}=1944\), so \(3^{n-1}=243=3^5\) and (n=6). Compare powers.
Exam Tip
\(8\cdot3^{n-1}=1944\), इसलिए \(3^{n-1}=243=3^5\) और (n=6)। घातों की तुलना करें।
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