Consider the series 1 (a) Does the sequence (a,) = -converge or diverge? (b) Does this series converge or diverge? (c) How many terms are required for the sum to exceed 50?

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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### Series Analysis

**Consider the series** \( \sum_{n=1}^{\infty} \frac{1}{n} \).

#### Questions:
1. **Does the sequence \( \{a_n\} = \frac{1}{n} \) converge or diverge?**
2. **Does this series converge or diverge?**
3. **How many terms are required for the sum to exceed 50?**

### Detailed Explanation:

For an educational website, here's how each question can be addressed:

#### (a) Sequence Analysis
**Question:**
Does the sequence \( \{a_n\} = \frac{1}{n} \) converge or diverge?

**Explanation:**
A sequence \( \{a_n\} \) converges if the limit \( \lim_{n \to \infty} a_n \) exists and is finite. For the sequence \( \{a_n\} = \frac{1}{n} \):

\[ \lim_{n \to \infty} \frac{1}{n} = 0 \]

Since the limit is 0, the sequence \( \{a_n\} \) converges.

#### (b) Series Convergence
**Question:**
Does this series converge or diverge?

**Explanation:**
For the series \( \sum_{n=1}^{\infty} \frac{1}{n} \), we need to determine if the sum of its terms converges to a finite value as \( n \) tends to infinity.

This specific series is known as the harmonic series, which is a well-known example of a divergent series despite its terms tending to zero individually.

Mathematically, this is proven via integral comparison or other methods in analysis, showing that the harmonic series diverges. Therefore:

The series \( \sum_{n=1}^{\infty} \frac{1}{n} \) diverges.

#### (c) Term Calculation for Sum Exceeding 50
**Question:**
How many terms are required for the sum to exceed 50?

**Explanation:**
To find the number of terms \( N \) such that \( \sum_{n=1}^{N} \frac{1}{n} > 50 \):

Recognizing that the harmonic series diverges but slowly, we approximate the partial sum \( S_N \) of the harmonic series using:

\[ S_N
Transcribed Image Text:### Series Analysis **Consider the series** \( \sum_{n=1}^{\infty} \frac{1}{n} \). #### Questions: 1. **Does the sequence \( \{a_n\} = \frac{1}{n} \) converge or diverge?** 2. **Does this series converge or diverge?** 3. **How many terms are required for the sum to exceed 50?** ### Detailed Explanation: For an educational website, here's how each question can be addressed: #### (a) Sequence Analysis **Question:** Does the sequence \( \{a_n\} = \frac{1}{n} \) converge or diverge? **Explanation:** A sequence \( \{a_n\} \) converges if the limit \( \lim_{n \to \infty} a_n \) exists and is finite. For the sequence \( \{a_n\} = \frac{1}{n} \): \[ \lim_{n \to \infty} \frac{1}{n} = 0 \] Since the limit is 0, the sequence \( \{a_n\} \) converges. #### (b) Series Convergence **Question:** Does this series converge or diverge? **Explanation:** For the series \( \sum_{n=1}^{\infty} \frac{1}{n} \), we need to determine if the sum of its terms converges to a finite value as \( n \) tends to infinity. This specific series is known as the harmonic series, which is a well-known example of a divergent series despite its terms tending to zero individually. Mathematically, this is proven via integral comparison or other methods in analysis, showing that the harmonic series diverges. Therefore: The series \( \sum_{n=1}^{\infty} \frac{1}{n} \) diverges. #### (c) Term Calculation for Sum Exceeding 50 **Question:** How many terms are required for the sum to exceed 50? **Explanation:** To find the number of terms \( N \) such that \( \sum_{n=1}^{N} \frac{1}{n} > 50 \): Recognizing that the harmonic series diverges but slowly, we approximate the partial sum \( S_N \) of the harmonic series using: \[ S_N
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