20. (-1)"(/n + 1 - n) | n=1 8.

Advanced Engineering Mathematics
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Chapter2: Second-order Linear Odes
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Test for convergence or divergence #20
Certainly! Here is a transcription of the mathematical series as they appear:

1. **Problem 12:**
   \[
   \sum_{n=1}^{\infty} (-1)^{n+1} n e^{-n}
   \]

2. **Problem 14:**
   \[
   \sum_{n=1}^{\infty} (-1)^{n-1} \arctan n
   \]

3. **Problem 16:**
   \[
   \sum_{n=1}^{\infty} \frac{n \cos n\pi}{2^n}
   \]

4. **Problem 18:**
   \[
   \sum_{n=1}^{\infty} (-1)^n \cos \left(\frac{\pi}{n}\right)
   \]

5. **Problem 20:**
   \[
   \sum_{n=1}^{\infty} (-1)^n \left(\sqrt{n + 1} - \sqrt{n}\right)
   \]

The image contains these series presented in a list format. There are no graphs or diagrams associated with the series. Each series represents an infinite summation starting from \( n = 1 \) to infinity.
Transcribed Image Text:Certainly! Here is a transcription of the mathematical series as they appear: 1. **Problem 12:** \[ \sum_{n=1}^{\infty} (-1)^{n+1} n e^{-n} \] 2. **Problem 14:** \[ \sum_{n=1}^{\infty} (-1)^{n-1} \arctan n \] 3. **Problem 16:** \[ \sum_{n=1}^{\infty} \frac{n \cos n\pi}{2^n} \] 4. **Problem 18:** \[ \sum_{n=1}^{\infty} (-1)^n \cos \left(\frac{\pi}{n}\right) \] 5. **Problem 20:** \[ \sum_{n=1}^{\infty} (-1)^n \left(\sqrt{n + 1} - \sqrt{n}\right) \] The image contains these series presented in a list format. There are no graphs or diagrams associated with the series. Each series represents an infinite summation starting from \( n = 1 \) to infinity.
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