It seems like you are working on a problem involving parallel and series combinations, likely referring to electrical resistances or some similar mathematical operations. Since I can't fully decipher all the details from the image alone, I will guide you on how to solve parallel and series combinations, assuming this relates to electrical resistors.

### 1. **Series Combination:**
   - **Rule:** When resistors \(R_1, R_2, \ldots, R_n\) are connected in series, the total resistance \(R_s\) is simply the sum of the individual resistances.
   \[
   R_s = R_1 + R_2 + \cdots + R_n
   \]

### 2. **Parallel Combination:**
   - **Rule:** When resistors \(R_1, R_2, \ldots, R_n\) are connected in parallel, the total resistance \(R_p\) is given by:
   \[
   \frac{1}{R_p} = \frac{1}{R_1} + \frac{1}{R_2} + \cdots + \frac{1}{R_n}
   \]
   Or equivalently,
   \[
   R_p = \left(\frac{1}{R_1} + \frac{1}{R_2} + \cdots + \frac{1}{R_n}\right)^{-1}
   \]

### **Example Problem:**

Let's say you have three resistors:

- \(R_1 = 100 \, \Omega\)
- \(R_2 = 200 \, \Omega\)
- \(R_3 = 300 \, \Omega\)

**a) If they are in series:**

\[
R_s = R_1 + R_2 + R_3 = 100 \, \Omega + 200 \, \Omega + 300 \, \Omega = 600 \, \Omega
\]

**b) If they are in parallel:**

\[
\frac{1}{R_p} = \frac{1}{100} + \frac{1}{200} + \frac{1}{300} = 0.01 + 0.005 + 0.00333 = 0.01833
\]
\[
R_p = \frac{1}{0.01833} \approx 54.55 \, \Omega
\]

### **How to Apply to Your Problem:**
If your image involves resistors arranged in a particular circuit:

- **Identify if the resistors are in series or parallel.**
- **Apply the corresponding formula to calculate the total resistance.**

If you'd like to continue with a specific part of your calculation or have particular resistances in mind, please share the details, and I'll provide the solution accordingly.

### Questions:
1. What values do you have for the resistors, and how are they arranged?
2. Are you dealing with any other components, like capacitors or inductors?
3. Do you need the formulas for power calculation in these circuits?
4. Is the goal to simplify the circuit or calculate specific parameters like voltage or current?
5. Do you need to consider the effect of any other factors, like temperature on resistance?

**Tip:** Always double-check whether components are in series or parallel before applying the formulas, as this distinction is crucial for accurate calculations.

Learn how to solve series and parallel resistance combinations in electrical circuits with detailed step-by-step solutions. This problem covers key concepts in electrical engineering, including series and parallel resistance formulas. Suitable for advanced high school students and beyond.

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