Calculus: Early Transcendentals
Calculus: Early Transcendentals
8th Edition
ISBN: 9781285741550
Author: James Stewart
Publisher: Cengage Learning
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A sequence is a list of numbers written in a definite order:  
\(a_1, a_2, a_3, a_4, \ldots, a_n, \ldots\). Each number is called a **term**, and \(a_n\) is called the **nth term**. The successor to \(a_n\) is represented by \(a_{n+1}\). A sequence can be considered a function whose domain is the **positive integers**.

For each of the following sequences, tell whether they converge or diverge as \(n \to \infty\).

a) \(a_n = \frac{1}{n}\)  
b) \(b_n = 1 - 2n\)  
c) \(b_n = \frac{2n}{3n+4}\)  
d) \(a_n = \sin n\)  
e) \(a_n = \frac{(-1)^n}{3^n + 5}\)  
f) \(t_n = \frac{100}{n!}\)

---

**(11.2)**  
A series is the sum of the terms of a sequence. To indicate the sum, we use sigma \(\Sigma\) notation. Write the following infinite sum in \(\Sigma\) notation:

\[1 + 3 + 9 + 27 + 81 + \ldots\]

What is the formula for the sum of an infinite geometric series?  
Under what conditions is this sum finite?
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Transcribed Image Text:A sequence is a list of numbers written in a definite order: \(a_1, a_2, a_3, a_4, \ldots, a_n, \ldots\). Each number is called a **term**, and \(a_n\) is called the **nth term**. The successor to \(a_n\) is represented by \(a_{n+1}\). A sequence can be considered a function whose domain is the **positive integers**. For each of the following sequences, tell whether they converge or diverge as \(n \to \infty\). a) \(a_n = \frac{1}{n}\) b) \(b_n = 1 - 2n\) c) \(b_n = \frac{2n}{3n+4}\) d) \(a_n = \sin n\) e) \(a_n = \frac{(-1)^n}{3^n + 5}\) f) \(t_n = \frac{100}{n!}\) --- **(11.2)** A series is the sum of the terms of a sequence. To indicate the sum, we use sigma \(\Sigma\) notation. Write the following infinite sum in \(\Sigma\) notation: \[1 + 3 + 9 + 27 + 81 + \ldots\] What is the formula for the sum of an infinite geometric series? Under what conditions is this sum finite?
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