यदि \(a_5=625\) और (r=5) है, तो पहला पद (a) क्या होगा?
If \(a_5=625\) and (r=5), what is the first term (a)?
Explanation opens after your attempt
A. (1)
Concept
\(a_5=ar^4\), so \(625=a\cdot5^4\) and (a=1). In exams, divide the fifth term by \(r^4\).
Why this answer is correct
The correct answer is A. (1). \(a_5=ar^4\), so \(625=a\cdot5^4\) and (a=1). In exams, divide the fifth term by \(r^4\).
Exam Tip
\(a_5=ar^4\), इसलिए \(625=a\cdot5^4\) और (a=1) है। परीक्षा में पाँचवें पद से \(r^4\) भाग दें।
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