यदि \(a_1=10\) और \(a_4=270\) है तथा (r) धनात्मक है, तो \(a_5\) क्या होगा?
If \(a_1=10\) and \(a_4=270\), and (r) is positive, what is \(a_5\)?
Explanation opens after your attempt
B. (810)
Concept
From \(270=10r^3\), \(r^3=27\) and (r=3), so \(a_5=270\cdot3=810\). In exams, find the ratio first.
Why this answer is correct
The correct answer is B. (810). From \(270=10r^3\), \(r^3=27\) and (r=3), so \(a_5=270\cdot3=810\). In exams, find the ratio first.
Exam Tip
\(270=10r^3\) से \(r^3=27\) और (r=3), इसलिए \(a_5=270\cdot3=810\) है। परीक्षा में पहले अनुपात निकालें।
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