Ch 185: Single Variable Calculus II (Sp24)- Online > Assessment omework for Section 6.2: Properties of Power Series ore: 11/13 11/13 answered • Question 8 Textbook < > @Videos [+] Evaluate the infinite series by identifying it as the value of a derivative of a geometric series. $\sum_{n=1}^{\infty} \frac{n}{9^n}$ Hint: Write it as $f'(\frac{1}{9})$ where $f(x) = \sum_{n=0}^{\infty} x^n$. Question Help: Post to forum Submit Question
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The sum of this series is given by the formula for the sum of an infinite geometric series: S = a / (1 - r), where a is the first term and r is the common ratio. In this case, a = 1 and r = x, so f(x) = 1 / (1 - x). Show more…
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