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(a) Can the circuit shown in Figure P 18.27 be reduced to a single resistor connected to the batteries? Explain. (b) Calculate each of the unknown currents $I_{1}, I_{2},$ and $I_{3}$ for the circuit.

a. no answer available

b. I_{1}=3.5 A, I_{2}=2.5 A, I_{3}=1 A

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