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The circuit is composed by 3 PMOS transistors (P 1, P2 and P3) and 3 NMOS transistors (N1, N2 and N3. It has two inputs (a and c ) and one output (f). An intermediate signal is also present (b).
Vdd Vdd Vdd P2 P3 P1 N1 N2 N3 GND GND
Expert Answer
You can use the image attached to understand the solution. As the transistors turn ON or OFF the voltage VDD is either transfered to output or output is grounded. Like when P1 is ON and N1 is OFF voltage Vdd is passed to “b” and b=1 in first line. Let me know for any further explanation if needed. 
