यदि \(a_2=30\) और \(a_5=810\) है, तथा अनुपात धनात्मक है, तो (r) क्या है?
If \(a_2=30\) and \(a_5=810\), and the ratio is positive, what is (r)?
Explanation opens after your attempt
B. (3)
Concept
\(a_5=a_2r^3\), so \(810=30r^3\) and \(r^3=27\), hence (r=3). The gap between positions decides the exponent.
Why this answer is correct
The correct answer is B. (3). \(a_5=a_2r^3\), so \(810=30r^3\) and \(r^3=27\), hence (r=3). The gap between positions decides the exponent.
Exam Tip
\(a_5=a_2r^3\), इसलिए \(810=30r^3\) और \(r^3=27\), अतः (r=3)। पदों की दूरी घात तय करती है।
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