गुणोत्तर श्रेढ़ी में \(a_3=18\) और \(a_5=288\) है। धनात्मक (r) के लिए \(a_7\) क्या होगा?
In a geometric progression, \(a_3=18\) and \(a_5=288\). For positive (r), what will \(a_7\) be?
Explanation opens after your attempt
C. (4608)
Concept
\(a_5=a_3r^2\), so \(r^2=16\), and \(a_7=288\cdot16=4608\). The same \(r^2\) applies over the same gap.
Why this answer is correct
The correct answer is C. (4608). \(a_5=a_3r^2\), so \(r^2=16\), and \(a_7=288\cdot16=4608\). The same \(r^2\) applies over the same gap.
Exam Tip
\(a_5=a_3r^2\), इसलिए \(r^2=16\), और \(a_7=288\cdot16=4608\)। समान दूरी पर वही \(r^2\) फिर लगता है।
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