यदि गुणोत्तर श्रेढ़ी में \(a_2=28\) और (r=4) है, तो \(a_1\) क्या होगा?
If a geometric progression has \(a_2=28\) and (r=4), what is \(a_1\)?
Explanation opens after your attempt
B. (7)
Concept
\(a_2=a_1r\), so \(28=a_1\cdot4\) and \(a_1=7\). Divide by the ratio to move backward.
Why this answer is correct
The correct answer is B. (7). \(a_2=a_1r\), so \(28=a_1\cdot4\) and \(a_1=7\). Divide by the ratio to move backward.
Exam Tip
\(a_2=a_1r\), इसलिए \(28=a_1\cdot4\) और \(a_1=7\)। पीछे जाने के लिए अनुपात से भाग दें।
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