किसी गुणोत्तर श्रेणी में पहला पद (5) और सातवाँ पद (320) है। यदि (r) धनात्मक है, तो (r) क्या है?
In a geometric progression, the first term is (5) and the seventh term is (320). If (r) is positive, what is (r)?
Explanation opens after your attempt
Correct Answer
A. (2)
Concept
From \(320=5r^6\), \(r^6=64=2^6\), so (r=2). In exams, remember \(r^6\) for the seventh term.
Why this answer is correct
The correct answer is A. (2). From \(320=5r^6\), \(r^6=64=2^6\), so (r=2). In exams, remember \(r^6\) for the seventh term.
Exam Tip
\(320=5r^6\) से \(r^6=64=2^6\), इसलिए (r=2) है। परीक्षा में सातवें पद के लिए \(r^6\) याद रखें।
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