The adder-subtractor of Fig. 5-2(b) is used to subtract the following unsigned 4-bit num-bers: 0110 - 1001 (6 - 9).
(a) What are the binary values in the nine inputs of the circuit?
(b) What are the binary values of the five outputs of the circuit? Explain how the output is related to the operation of 6 - 9.
