किसी गुणोत्तर श्रेणी में पहला पद (4) और पाँचवाँ पद (324) है। यदि (r) धनात्मक है, तो (r) क्या है?
In a geometric progression, the first term is (4) and the fifth term is (324). If (r) is positive, what is (r)?
Explanation opens after your attempt
B. (3)
Concept
From \(324=4r^4\), \(r^4=81=3^4\), so (r=3). In exams, remember \(r^4\) for the fifth term.
Why this answer is correct
The correct answer is B. (3). From \(324=4r^4\), \(r^4=81=3^4\), so (r=3). In exams, remember \(r^4\) for the fifth term.
Exam Tip
\(324=4r^4\) से \(r^4=81=3^4\), इसलिए (r=3) है। परीक्षा में पाँचवें पद के लिए \(r^4\) याद रखें।
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