गुणोत्तर श्रेणी \(5,15,45,135,\ldots\) का तेरहवाँ पद क्या है?
What is the thirteenth term of the geometric progression \(5,15,45,135,\ldots\)?
Explanation opens after your attempt
C. (2657205)
Concept
Here (a=5) and (r=3), so \(a_{13}=5\cdot3^{12}=2657205\). In exams, use \(a_n=ar^{n-1}\).
Why this answer is correct
The correct answer is C. (2657205). Here (a=5) and (r=3), so \(a_{13}=5\cdot3^{12}=2657205\). In exams, use \(a_n=ar^{n-1}\).
Exam Tip
यहाँ (a=5) और (r=3) है, इसलिए \(a_{13}=5\cdot3^{12}=2657205\) है। परीक्षा में \(a_n=ar^{n-1}\) लगाएँ।
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