Here the substructure of a single bit full adder is prepared and its carry is given as the third input to next single bit full adder by following this you can prepare n bit full adder.
Here 4 bit full adder is prepared. In this the sum at all respective adders is shown in output and the last carry is also shown.
Here you may also construct the the full adder substructure using the two half adder substructures in it.
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