यदि गुणोत्तर श्रेढ़ी \(a,ar,ar^2,\ldots\) में \(a_2+a_3=30\) और (r=2) है, तो \(a_1\) क्या होगा?
If in the geometric progression \(a,ar,ar^2,\ldots\), \(a_2+a_3=30\) and (r=2), what will be \(a_1\)?
Explanation opens after your attempt
B. (5)
Concept
\(a_2=2a_1\) and \(a_3=4a_1\), so \(6a_1=30\) and \(a_1=5\). First write the sum using \(a_1\) and (r).
Why this answer is correct
The correct answer is B. (5). \(a_2=2a_1\) and \(a_3=4a_1\), so \(6a_1=30\) and \(a_1=5\). First write the sum using \(a_1\) and (r).
Exam Tip
\(a_2=2a_1\) और \(a_3=4a_1\), इसलिए \(6a_1=30\) और \(a_1=5\)। योग को पहले \(a_1\) और (r) से लिखें।
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