A full adder logic circuit will have

2 inputs and 1 output.

3 inputs and 3 outputs.

3 inputs and 2 outputs

2 inputs and2 outputs

A full adder circuit will add two bits and it will also accounts the carry input generated in the previous stage.
Thus three inputs and two outputs (Sum and Carry) are there.
A full adder circuit is central to most digital circuits that perform addition or subtraction.

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