Resistors $R_2$, $R_3$, and $R_4$ are in parallel. Since they are identical, their equivalent resistance $R_{234}$ is given by:
$$ \frac{1}{R_{234}} = \frac{1}{R_2} + \frac{1}{R_3} + \frac{1}{R_4} = \frac{1}{3.00} + \frac{1}{3.00} + \frac{1}{3.00} = \frac{3}{3.00}
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