Use 4 NOR gates For the 1st NOR gate, inputs should be x' and y For the 2nd NOR gate,inputs should be y' and x The outputs of NOR 1 and NOR 2 are taken as inputs of NOR gate 3 The output of NOR 3 is the complemented form of the output required, so, just complement the output of NOR gate 3 with another NOR gate and Viola! , you have your HALF ADDER OUTPUT PS:I have used a double rail logic, where both x:x' and y:y' are available.
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