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The boolean equation for $C_o$ in Full Adder is: $$C_o = A.B + C_i(A+B)$$ Implementing above expression in CMOS logic will give you its complementary version at the output of Full Adder cell: $$\overline{C_o} = \overline{A.B + C_i(A+B)} \tag{1}$$ So you have to add an inverter at the output stage to get $C_o$: \overline{C_o} \rightarrow \fbox{INVERTER}\...