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The problem is asking for the formula of the \(n\)-th term of the arithmetic sequence \(-1, 1, 3, 5, \dots\).

To solve this, we need to recognize that an arithmetic sequence follows the pattern:

\[
U_n = a + (n-1) \cdot d
\]

where:
- \(U_n\) is the \(n\)-th term,
- \(a\) is the first term of the sequence,
- \(d\) is the common difference between consecutive terms,
- \(n\) is the term number.

### Step 1: Identify the first term \(a\) and the common difference \(d\)
- The first term \(a = -1\).
- The common difference \(d = 1 - (-1) = 2\).

### Step 2: Substitute the values into the formula
\[
U_n = -1 + (n-1) \cdot 2
\]
Simplifying:
\[
U_n = -1 + 2n - 2
\]
\[
U_n = 2n - 3
\]

### Conclusion:
The formula for the \(n\)-th term of this arithmetic sequence is \(U_n = 2n - 3\), which corresponds to option **C**.

Would you like further details or have any questions?

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Here are 5 related questions you might find helpful:
1. How do you determine the common difference in an arithmetic sequence?
2. What is the general formula for the sum of the first \(n\) terms of an arithmetic sequence?
3. How do arithmetic sequences differ from geometric sequences?
4. Can an arithmetic sequence have a common difference of 0?
5. What is the significance of the first term \(a\) in determining the pattern of a sequence?

**Tip:** Always check for the common difference first when identifying the pattern in arithmetic sequences!

Rumus suku ke-n dari barisan aritmetika -1, 1, 3, 5,... adalah ....

Learn how to find the nth term formula for the arithmetic sequence -1, 1, 3, 5,... with a detailed step-by-step solution. Understand key concepts like the first term and common difference to apply the arithmetic sequence formula. Suitable for students in Grades 9-10.

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