Given the circuit of Figure P10.10, determine the current IR. Let RB = 30 k?, RC1 = 1 k?, RC2 = 3 k?, R = 7 k?, VBB1 = 4 V, VBB2 = 3 V, VCC = 10 V, ?1 = 40, and ?2 = 60.
Known quantities:
Figure P10.10, assuming 
Find:
IR
Analysis:
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