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The image contains an expression related to a sequence or a ratio. The expression is:

\[
\frac{A = 1}{2a - b} \quad \text{where} \quad B = 3
\]

Let me analyze this and provide details on how to construct an arithmetic sequence from it.

### Step-by-Step Breakdown:

1. **Expression Overview**:
   The given formula seems to relate to the construction of an arithmetic sequence using the values \( A \) and \( B \). We have:
   - \( A = 1 \)
   - \( B = 3 \)
   - The denominator expression: \( 2a - b \)

2. **Constructing the Sequence**:
   To create an arithmetic sequence, we generally need an initial term and a common difference. However, this depends on how \( a \) and \( b \) are defined within the context of the sequence. Let's assume the following:
   
   - \( A \) might represent the first term of the sequence.
   - \( B \) could represent the common difference.

### Let's assume the sequence starts with \( A \) as the first term and has a common difference of \( B \).

Given these assumptions, the arithmetic sequence would follow the formula:

\[
a_n = A + (n - 1) \cdot B
\]

Thus, the first few terms of the sequence are:
- \( a_1 = 1 \)
- \( a_2 = 1 + 3 = 4 \)
- \( a_3 = 1 + 2 \cdot 3 = 7 \)
- \( a_4 = 1 + 3 \cdot 3 = 10 \)

The arithmetic sequence formed would be:  
\[ 1, 4, 7, 10, \dots \]

### Conclusion:
The arithmetic sequence starting with \( A = 1 \) and having a common difference \( B = 3 \) is:  
\[ 1, 4, 7, 10, \dots \]

Would you like more details or have any questions?

Here are 5 related questions to deepen your understanding:
1. How is an arithmetic sequence different from a geometric sequence?
2. What is the general formula for the sum of the first \( n \) terms of an arithmetic sequence?
3. How does the common difference affect the growth of an arithmetic sequence?
4. Can you determine the 100th term of this arithmetic sequence?
5. How can this arithmetic sequence be applied in real-world problems, such as savings or interest calculations?

**Tip**: When working with sequences, always check the first term and the common difference to ensure you construct the pattern correctly.

Learn how to construct an arithmetic sequence starting with A = 1 and having a common difference B = 3. This detailed guide covers the arithmetic sequence formula and step-by-step examples. Suitable for students in Grades 7-9.

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