Question: please solve question with all parts 2. Construct a BCD adder-subtractor circuit. Assume we have a circuit to calculate the 9's complement that takes a

please solve question with all parts

2. Construct a BCD adder-subtractor circuit. Assume we have a circuit to calculate the 9's complement that takes a BCD digit and produces its complement. Use the 9's complementor, a BCD adder (adds two BCD digits and produces the correct output), and any other components you need. Show the block-level design of this circuit and explain how to use it for addition or subtraction

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