गुणोत्तर श्रेणी \(5,20,80,320,\ldots\) में (5120) कौन-सा पद है?
In the geometric progression \(5,20,80,320,\ldots\), which term is (5120)?
Explanation opens after your attempt
B. छठा पद(6)th term
Concept
From \(5\cdot4^{n-1}=5120\), \(4^{n-1}=1024=4^5\), so (n=6). In exams, equate powers to find (n).
Why this answer is correct
The correct answer is B. छठा पद / (6)th term. From \(5\cdot4^{n-1}=5120\), \(4^{n-1}=1024=4^5\), so (n=6). In exams, equate powers to find (n).
Exam Tip
\(5\cdot4^{n-1}=5120\) से \(4^{n-1}=1024=4^5\), इसलिए (n=6) है। परीक्षा में घातों को बराबर करके (n) निकालें।
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