Answer
$\frac{1}{4} - \frac{1}{6} + \frac{1}{8} = \frac{5}{24}$
Work Step by Step
$\sum_{i=2}^4\frac{(-1)^i}{2i} =\frac{1}{4} - \frac{1}{6} + \frac{1}{8} = \frac{5}{24}$
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