Question: Using two 4 - bit registers R 1 and R 2 , a 4 - bit adder, a 2 - to - 1 multiplexer, and

Using two 4-bit registers R1 and R2, a 4-bit adder, a 2-to-1 multiplexer, and a 4-to-1 multiplexer, construct a circuit that implements the following operations under the control of the three multiplexer select inputs and the adders carry-in input:
R1+ R2, R1- R2, R2- R1, R1-1,-(R1+1),0,-1

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