गुणोत्तर श्रेणी \(2,6,18,54,\ldots\) के पहले (6) पदों का योग क्या है?
What is the sum of the first (6) terms of the geometric progression \(2,6,18,54,\ldots\)?
Explanation opens after your attempt
C. (728)
Concept
The sum of the first (6) terms is (2\(3^6-1\)/(3-1)=728). In exams use (S_n=\frac{a\(r^n-1\)}{r-1}) for (r>1).
Why this answer is correct
The correct answer is C. (728). The sum of the first (6) terms is (2\(3^6-1\)/(3-1)=728). In exams use (S_n=\frac{a\(r^n-1\)}{r-1}) for (r>1).
Exam Tip
पहले (6) पदों का योग (2\(3^6-1\)/(3-1)=728) है। परीक्षा में (r>1) के लिए (S_n=\frac{a\(r^n-1\)}{r-1}) लगाएँ।
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