The parameters of each transistor in the circuits shown in Figure P6.7 are (beta=120) and (I_{C Q}=0.5

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The parameters of each transistor in the circuits shown in Figure P6.7 are \(\beta=120\) and \(I_{C Q}=0.5 \mathrm{~mA}\). Determine the input resistance \(R_{i}\) for each circuit.

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