यदि \(a_4=80\) और (r=2) है तो \(a_9\) का मान क्या होगा?
If \(a_4=80\) and (r=2), what is the value of \(a_9\)?
Explanation opens after your attempt
C. (2560)
Concept
There are (5) steps from the fourth to the ninth term, so \(a_9=80\cdot2^5=2560\). In exams count the position gap.
Why this answer is correct
The correct answer is C. (2560). There are (5) steps from the fourth to the ninth term, so \(a_9=80\cdot2^5=2560\). In exams count the position gap.
Exam Tip
चौथे से नौवें पद तक (5) कदम हैं इसलिए \(a_9=80\cdot2^5=2560\) है। परीक्षा में पद-संख्या का अंतर गिनें।
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