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7. The parallel combination of a 470 Ω resistor and a 680 Ω resistor is in series with the parallel combination of four 2 kΩ resistors. The total resistance is ________.
(a) 1,650 Ω
(b) 1,078 Ω
(c) 77.8 Ω
(d) 778 Ω
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