यदि \(a_n=5\cdot2^{n-1}\) है, तो \(a_n=320\) के लिए (n) क्या होगा?
If \(a_n=5\cdot2^{n-1}\), what will (n) be for \(a_n=320\)?
Explanation opens after your attempt
C. (7)
Concept
\(5\cdot2^{n-1}=320\), so \(2^{n-1}=64=2^6\) and (n=7). Compare powers.
Why this answer is correct
The correct answer is C. (7). \(5\cdot2^{n-1}=320\), so \(2^{n-1}=64=2^6\) and (n=7). Compare powers.
Exam Tip
\(5\cdot2^{n-1}=320\), इसलिए \(2^{n-1}=64=2^6\) और (n=7)। घातों की तुलना करें।
Login to save your score, XP, coins and progress.
