गुणोत्तर श्रेणी \(6,18,54,\ldots\) में कितने पदों तक योग (2184) होगा?
How many terms of the geometric progression \(6,18,54,\ldots\) have sum (2184)?
Explanation opens after your attempt
C. (6)
Concept
(S_n=\frac{6\(3^n-1\)}{3-1}=3\(3^n-1\)), and (3\(3^n-1\)=2184) gives (n=6). In exams, simplify the sum and identify the power.
Why this answer is correct
The correct answer is C. (6). (S_n=\frac{6\(3^n-1\)}{3-1}=3\(3^n-1\)), and (3\(3^n-1\)=2184) gives (n=6). In exams, simplify the sum and identify the power.
Exam Tip
(S_n=\frac{6\(3^n-1\)}{3-1}=3\(3^n-1\)) और (3\(3^n-1\)=2184) से (n=6) है। परीक्षा में योग को सरल करके घात पहचानें।
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