यदि \(a_1=4\) और \(a_4=500\) है, तथा (r) धनात्मक है, तो \(a_5\) क्या होगा?
If \(a_1=4\) and \(a_4=500\), and (r) is positive, what will \(a_5\) be?
Explanation opens after your attempt
C. (2500)
Concept
\(500=4r^3\), so \(r^3=125\) and (r=5), hence \(a_5=2500\). First find the ratio and then form the next term.
Why this answer is correct
The correct answer is C. (2500). \(500=4r^3\), so \(r^3=125\) and (r=5), hence \(a_5=2500\). First find the ratio and then form the next term.
Exam Tip
\(500=4r^3\), इसलिए \(r^3=125\) और (r=5), अतः \(a_5=2500\)। पहले अनुपात निकालें फिर अगला पद बनाएं।
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