यदि \(a_2=10\) और \(a_6=160\) है, तथा अनुपात धनात्मक है, तो \(a_1\) क्या होगा?
If \(a_2=10\) and \(a_6=160\), and the ratio is positive, what will be \(a_1\)?
Explanation opens after your attempt
D. (5)
Concept
\(a_6=a_2r^4\), so \(160=10r^4\) and (r=2), hence \(a_1=5\). Divide by the ratio to move backward.
Why this answer is correct
The correct answer is D. (5). \(a_6=a_2r^4\), so \(160=10r^4\) and (r=2), hence \(a_1=5\). Divide by the ratio to move backward.
Exam Tip
\(a_6=a_2r^4\), इसलिए \(160=10r^4\) और (r=2), अतः \(a_1=5\)। पीछे जाने के लिए अनुपात से भाग दें।
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