Let U = {1,5,7,8,10,13,15,17,18). Determine the complement of the set (5,7,10,15,18).

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ISBN:9780470458365
Author:Erwin Kreyszig
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**Set Theory: Understanding Complements**

**Problem Statement:**

Given the universal set \( U = \{1, 5, 7, 8, 10, 13, 15, 17, 18\} \), determine the complement of the set \( \{5, 7, 10, 15, 18\} \).

**Solution:**

The complement of a set \( A \) with respect to a universal set \( U \) includes all the elements that are in \( U \) but not in \( A \).

**Steps to find the complement:**

1. Identify the universal set \( U \).
2. Identify the set \( A \) for which the complement is being determined.
3. Subtract the elements of \( A \) from \( U \).

**Given Data:**

- Universal set \( U = \{1, 5, 7, 8, 10, 13, 15, 17, 18\} \)
- Set \( A = \{5, 7, 10, 15, 18\} \)

**Complement Calculation:**

Find all elements in \( U \) that are not in \( A \):
- Elements in \( U \): 1, 5, 7, 8, 10, 13, 15, 17, 18
- Elements in \( A \): 5, 7, 10, 15, 18

Elements in \( U \) but not in \( A \): 1, 8, 13, 17

**Result:**

The complement of the set \( \{5, 7, 10, 15, 18\} \) is:
\[ \{1, 8, 13, 17\} \]

**Instructions for Students:**

- Write the answers separated by commas.
- Ensure the elements are in ascending order.

**Example Answer:**

The complement is \( \{1, 8, 13, 17\} \).
Transcribed Image Text:**Set Theory: Understanding Complements** **Problem Statement:** Given the universal set \( U = \{1, 5, 7, 8, 10, 13, 15, 17, 18\} \), determine the complement of the set \( \{5, 7, 10, 15, 18\} \). **Solution:** The complement of a set \( A \) with respect to a universal set \( U \) includes all the elements that are in \( U \) but not in \( A \). **Steps to find the complement:** 1. Identify the universal set \( U \). 2. Identify the set \( A \) for which the complement is being determined. 3. Subtract the elements of \( A \) from \( U \). **Given Data:** - Universal set \( U = \{1, 5, 7, 8, 10, 13, 15, 17, 18\} \) - Set \( A = \{5, 7, 10, 15, 18\} \) **Complement Calculation:** Find all elements in \( U \) that are not in \( A \): - Elements in \( U \): 1, 5, 7, 8, 10, 13, 15, 17, 18 - Elements in \( A \): 5, 7, 10, 15, 18 Elements in \( U \) but not in \( A \): 1, 8, 13, 17 **Result:** The complement of the set \( \{5, 7, 10, 15, 18\} \) is: \[ \{1, 8, 13, 17\} \] **Instructions for Students:** - Write the answers separated by commas. - Ensure the elements are in ascending order. **Example Answer:** The complement is \( \{1, 8, 13, 17\} \).
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