यदि किसी गुणोत्तर श्रेढ़ी में \(a_2=18\) और \(a_4=162\) है, तो (r) क्या होगा?
If a geometric progression has \(a_2=18\) and \(a_4=162\), what is (r)?
Explanation opens after your attempt
B. (3)
Concept
\(a_4=a_2r^2\), so \(162=18r^2\) and \(r^2=9\), giving positive ratio (r=3). Use the gap between terms as the exponent.
Why this answer is correct
The correct answer is B. (3). \(a_4=a_2r^2\), so \(162=18r^2\) and \(r^2=9\), giving positive ratio (r=3). Use the gap between terms as the exponent.
Exam Tip
\(a_4=a_2r^2\), इसलिए \(162=18r^2\) और \(r^2=9\), धनात्मक अनुपात (r=3) है। पदों के बीच दूरी को घात बनाएं।
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