यदि \(a_7=2187\) और (r=3) है, तो \(a_1\) का मान क्या है?
If \(a_7=2187\) and (r=3), what is the value of \(a_1\)?
Explanation opens after your attempt
C. (3)
Concept
\(a_7=a\cdot3^6\), so \(a=2187\div729=3\). In exams, divide the seventh term by \(r^6\).
Why this answer is correct
The correct answer is C. (3). \(a_7=a\cdot3^6\), so \(a=2187\div729=3\). In exams, divide the seventh term by \(r^6\).
Exam Tip
\(a_7=a\cdot3^6\), इसलिए \(a=2187\div729=3\) है। परीक्षा में सातवें पद से \(r^6\) भाग दें।
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