यदि \(a_5=486\) और (r=3) है तो \(a_1\) का मान क्या है?
If \(a_5=486\) and (r=3), what is the value of \(a_1\)?
Explanation opens after your attempt
C. (6)
Concept
\(a_5=a\cdot3^4\), so \(a=486\div81=6\). In exams divide the fifth term by \(r^4\).
Why this answer is correct
The correct answer is C. (6). \(a_5=a\cdot3^4\), so \(a=486\div81=6\). In exams divide the fifth term by \(r^4\).
Exam Tip
\(a_5=a\cdot3^4\) इसलिए \(a=486\div81=6\) है। परीक्षा में पाँचवें पद से \(r^4\) भाग दें।
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