गुणोत्तर श्रेणी \(1,3,9,27,\ldots\) के पहले (7) पदों का योग क्या है?
What is the sum of the first (7) terms of the geometric progression \(1,3,9,27,\ldots\)?
Explanation opens after your attempt
A. (1093)
Concept
\(S_7=\frac{3^7-1}{3-1}=1093\). In exams the form \(\frac{r^n-1}{r-1}\) is useful for (r>1).
Why this answer is correct
The correct answer is A. (1093). \(S_7=\frac{3^7-1}{3-1}=1093\). In exams the form \(\frac{r^n-1}{r-1}\) is useful for (r>1).
Exam Tip
\(S_7=\frac{3^7-1}{3-1}=1093\) है। परीक्षा में (r>1) के लिए \(\frac{r^n-1}{r-1}\) रूप उपयोगी है।
Login to save your score, XP, coins and progress.
