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6. A 15 Ω resistor, an inductor with 8 Ω inductive reactance, and a capacitor with 12 Ω capacitive reactance are in parallel across an ac voltage source. The circuit impedance is ________.
(a) 12.7 Ω
(b) 127 Ω
(c) 4,436 Ω
(d) 6,174 Ω
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