The $1.0 \Omega$ and $1.0 \Omega$ resistors are in series, so their equivalent resistance is $1.0 \Omega + 1.0 \Omega = 2.0 \Omega$. Then, the $4.0 \Omega$ and $4.0 \Omega$ resistors are in parallel, so their equivalent resistance is given by $\frac{1}{4.0 \Omega}
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