0-Ω and 9.0-Ω resistors. The formula for resistors in parallel is:
$$\frac{1}{R_{eq}} = \frac{1}{R_1} + \frac{1}{R_2}$$
Plugging in the values, we get:
$$\frac{1}{R_{eq}} = \frac{1}{5.0} + \frac{1}{9.0}$$
Solving for $R_{eq}$, we get:
$$R_{eq} =
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