(a) In series, the total resistance is the sum of the individual resistances:
$R_{total} = R_1 + R_2 + R_3 = 300\Omega + 300\Omega + 300\Omega = 900\Omega$
(b) In parallel, the total resistance is given by the formula:
$\frac{1}{R_{total}} = \frac{1}{R_1} +
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