Find the 5th partial sum, 55 of the series Σ(-1)" n=2 $5 = 0 ∞0 X

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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**Problem Statement:**

Find the 5th partial sum, \( s_5 \), of the series 

\[
\sum_{n=2}^{\infty} (-1)^n 
\]

**Solution:**

\[ s_5 = \boxed{0} \]

**Feedback:**

The answer provided, \( s_5 = 0 \), is incorrect (indicated by a red cross). 

To find the correct 5th partial sum of the series \(\sum_{n=2}^{n=6} (-1)^n\), sum the terms from \(n = 2\) to \(n = 6\):

1. \(n = 2 \Rightarrow (-1)^2 = 1\)
2. \(n = 3 \Rightarrow (-1)^3 = -1\)
3. \(n = 4 \Rightarrow (-1)^4 = 1\)
4. \(n = 5 \Rightarrow (-1)^5 = -1\)
5. \(n = 6 \Rightarrow (-1)^6 = 1\)

Adding these values gives:

\[ 1 + (-1) + 1 + (-1) + 1 = 1 \]

Therefore, the correct value for \( s_5 \) should be \( \boxed{1} \).
Transcribed Image Text:**Problem Statement:** Find the 5th partial sum, \( s_5 \), of the series \[ \sum_{n=2}^{\infty} (-1)^n \] **Solution:** \[ s_5 = \boxed{0} \] **Feedback:** The answer provided, \( s_5 = 0 \), is incorrect (indicated by a red cross). To find the correct 5th partial sum of the series \(\sum_{n=2}^{n=6} (-1)^n\), sum the terms from \(n = 2\) to \(n = 6\): 1. \(n = 2 \Rightarrow (-1)^2 = 1\) 2. \(n = 3 \Rightarrow (-1)^3 = -1\) 3. \(n = 4 \Rightarrow (-1)^4 = 1\) 4. \(n = 5 \Rightarrow (-1)^5 = -1\) 5. \(n = 6 \Rightarrow (-1)^6 = 1\) Adding these values gives: \[ 1 + (-1) + 1 + (-1) + 1 = 1 \] Therefore, the correct value for \( s_5 \) should be \( \boxed{1} \).
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