यदि \(a_5=243\) और (r=3) है, तो पहला पद (a) क्या होगा?
If \(a_5=243\) and (r=3), what is the first term (a)?
Explanation opens after your attempt
C. (3)
Concept
\(a_5=ar^4\), so \(243=a\cdot81\) and (a=3). In exams, divide the fifth term by \(r^4\).
Why this answer is correct
The correct answer is C. (3). \(a_5=ar^4\), so \(243=a\cdot81\) and (a=3). In exams, divide the fifth term by \(r^4\).
Exam Tip
\(a_5=ar^4\), इसलिए \(243=a\cdot81\) और (a=3) है। परीक्षा में पाँचवें पद से \(r^4\) भाग दें।
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