यदि गुणोत्तर श्रेढ़ी में \(a_3=45\) और (r=3) है, तो \(a_1\) क्या होगा?
If a geometric progression has \(a_3=45\) and (r=3), what is \(a_1\)?
Explanation opens after your attempt
B. (5)
Concept
\(a_3=a_1r^2\), so \(45=a_1\cdot9\) and \(a_1=5\). Divide by \(r^2\) to move two terms backward.
Why this answer is correct
The correct answer is B. (5). \(a_3=a_1r^2\), so \(45=a_1\cdot9\) and \(a_1=5\). Divide by \(r^2\) to move two terms backward.
Exam Tip
\(a_3=a_1r^2\), इसलिए \(45=a_1\cdot9\) और \(a_1=5\)। दो पद पीछे जाने के लिए \(r^2\) से भाग दें।
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