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The problem is asking for the set difference \( A - B \), where:

- \( A = \{1, 2, 3, 4, 5, 6\} \)
- \( B = \{2, 4, 6, 8\} \)

The set difference \( A - B \) includes all elements that are in \( A \) but not in \( B \).

### Steps:
1. List all elements in \( A \) and \( B \).
2. Remove any element from \( A \) that is also in \( B \).

So:
- \( A = \{1, 2, 3, 4, 5, 6\} \)
- \( B = \{2, 4, 6, 8\} \)

Removing the elements common to both:
- Elements \( 2, 4, 6 \) are in both \( A \) and \( B \).

Thus, \( A - B = \{1, 3, 5\} \).

### Answer:
The correct answer is (A) \( \{1, 3, 5\} \).

Do you need more details or have any other questions?

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Here are 5 related questions to explore this topic further:

1. What is the union of two sets \( A \) and \( B \)?
2. How do you find the intersection of two sets?
3. What is the symmetric difference between two sets?
4. Can you explain the properties of set operations like associativity and commutativity?
5. How does the Cartesian product of two sets differ from their union?

**Tip:** Always remember that the set difference \( A - B \) is not the same as \( B - A \); the order matters!

Let A = {1, 2, 3, 4, 5, 6} and B = {2, 4, 6, 8}, then A - B is?

Learn how to solve a set difference problem with A = {1, 2, 3, 4, 5, 6} and B = {2, 4, 6, 8}. This problem covers key set theory concepts, including set difference and related theorems. Suitable for students in Grades 6-9.

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