Consider the low order four bits of the adder/subtractor circuit shown below. Label all wires (inputs, outputs) in the circuit by their value (0 or 1), assuming the circuit is computing A ? B where A = 98 and B = ?25.

[Do not draw the entire circuit. Only consider the four lowest order bits for this question.] What are the binary values of the following full adder in ?

(use the following diagram and enter the correct value for each of the question mark : - 0.5 for each wrong answer)

Binvert Ao 2 Bo Al Bl B2 B3