यदि \(a_7=320\) और (a=5) है तथा (r) धनात्मक है, तो (r) क्या होगा?
If \(a_7=320\) and (a=5), and (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, identify \(r^6\) 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, identify \(r^6\) 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 \(r^6\) पहचानें।
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