The formula for the equivalent resistance \( R_{eq} \) of two resistors in parallel is given by:
\[
\frac{1}{R_{eq}} = \frac{1}{R_1} + \frac{1}{R_2}
\]
where \( R_1 = 9.0 \, \Omega \) and \( R_2 = 3.0 \, \Omega \).
Calculating:
\[
\frac{1}{R_{eq}} = \frac{1}{9.0}
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