यदि \(a_1=3\) और \(a_5=243\) है, तो धनात्मक सार्व अनुपात क्या होगा?
If \(a_1=3\) and \(a_5=243\), what will be the positive common ratio?
Explanation opens after your attempt
B. (3)
Concept
\(a_5=a_1r^4\), so \(243=3r^4\) and \(r^4=81\), hence (r=3). When positive ratio is asked, take the positive root.
Why this answer is correct
The correct answer is B. (3). \(a_5=a_1r^4\), so \(243=3r^4\) and \(r^4=81\), hence (r=3). When positive ratio is asked, take the positive root.
Exam Tip
\(a_5=a_1r^4\), इसलिए \(243=3r^4\) और \(r^4=81\), अतः (r=3)। धनात्मक अनुपात मांगने पर धनात्मक मूल लें।
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