गुणोत्तर श्रेणी \(10,40,160,\ldots\) का कौन-सा पद (10240) है?
Which term of the geometric progression \(10,40,160,\ldots\) is (10240)?
Explanation opens after your attempt
Correct Answer
A. छठा पद(6)th term
Concept
From \(10\cdot4^{n-1}=10240\), \(4^{n-1}=1024=4^5\), so (n=6). In exams, equate powers to find the term number.
Why this answer is correct
The correct answer is A. छठा पद / (6)th term. From \(10\cdot4^{n-1}=10240\), \(4^{n-1}=1024=4^5\), so (n=6). In exams, equate powers to find the term number.
Exam Tip
\(10\cdot4^{n-1}=10240\) से \(4^{n-1}=1024=4^5\), इसलिए (n=6) है। परीक्षा में घात बराबर करके पद संख्या निकालें।
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