यदि \(a_2=40\) और \(a_5=320\) है, तथा अनुपात धनात्मक है, तो (r) क्या है?
If \(a_2=40\) and \(a_5=320\), and the ratio is positive, what is (r)?
Explanation opens after your attempt
A. (2)
Concept
\(a_5=a_2r^3\), so \(320=40r^3\) and \(r^3=8\), hence (r=2). The gap between positions decides the exponent.
Why this answer is correct
The correct answer is A. (2). \(a_5=a_2r^3\), so \(320=40r^3\) and \(r^3=8\), hence (r=2). The gap between positions decides the exponent.
Exam Tip
\(a_5=a_2r^3\), इसलिए \(320=40r^3\) और \(r^3=8\), अतः (r=2)। पदों की दूरी घात तय करती है।
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