यदि \(a_1=8\) और \(a_4=216\) है तथा (r) धनात्मक है, तो \(a_5\) क्या होगा?
If \(a_1=8\) and \(a_4=216\), and (r) is positive, what is \(a_5\)?
Explanation opens after your attempt
C. (648)
Concept
From \(216=8r^3\), \(r^3=27\) and (r=3), so \(a_5=216\cdot3=648\). In exams, find the ratio first.
Why this answer is correct
The correct answer is C. (648). From \(216=8r^3\), \(r^3=27\) and (r=3), so \(a_5=216\cdot3=648\). In exams, find the ratio first.
Exam Tip
\(216=8r^3\) से \(r^3=27\) और (r=3), इसलिए \(a_5=216\cdot3=648\) है। परीक्षा में पहले अनुपात निकालें।
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