यदि गुणोत्तर श्रेढ़ी में \(a_2=10\) और \(a_4=250\) है, तो धनात्मक (r) के लिए \(a_1+a_5\) क्या होगा?
If a geometric progression has \(a_2=10\) and \(a_4=250\), what will \(a_1+a_5\) be for positive (r)?
Explanation opens after your attempt
B. (1252)
Concept
\(a_4=a_2r^2\), so (r=5), \(a_1=2\), and \(a_5=1250\), hence the sum is (1252). Find (r) first.
Why this answer is correct
The correct answer is B. (1252). \(a_4=a_2r^2\), so (r=5), \(a_1=2\), and \(a_5=1250\), hence the sum is (1252). Find (r) first.
Exam Tip
\(a_4=a_2r^2\), इसलिए (r=5), \(a_1=2\) और \(a_5=1250\), अतः योग (1252) है। पहले (r) निकालें।
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