To solve the series \( S = 1 - \frac{1}{2} + \frac{1}{4} - \frac{1}{8} + \frac{1}{16} - \frac{1}{32} + \ldots \), we can recognize that this series is an infinite geometric progression (GP).
### Step-by-Step Solution:
1. **Identify the first term (A) and the common ratio (R)**:
- The first term \( A = 1 \).
- The common ratio \( R \) can be found by dividing the second term by the first term:
\[
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