यदि \(a_3=36\) और \(a_7=576\) है, तथा अनुपात धनात्मक है, तो \(a_1\) क्या होगा?
If \(a_3=36\) and \(a_7=576\), and the ratio is positive, what will \(a_1\) be?
Explanation opens after your attempt
Correct Answer
B. (9)
Concept
\(a_7=a_3r^4\), so \(576=36r^4\) and (r=2), hence \(a_1=\frac{36}{2^2}=9\). Divide by the ratio to move backward.
Why this answer is correct
The correct answer is B. (9). \(a_7=a_3r^4\), so \(576=36r^4\) and (r=2), hence \(a_1=\frac{36}{2^2}=9\). Divide by the ratio to move backward.
Exam Tip
\(a_7=a_3r^4\), इसलिए \(576=36r^4\) और (r=2), अतः \(a_1=\frac{36}{2^2}=9\)। पीछे जाने के लिए अनुपात से भाग दें।
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