The expansion $\log_e(1 + x) = \sum\limits_{i = 1}^\infty \left[ \frac{(-1)^{i + 1}x^i}{i} \right]$ is defined for:
- A$x \in (-1, 1)$
- BAny positive real $x$
- C$x \in (-1, 1]$
- DAny positive real $x$ where $x \neq 1$
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