Implement full adder using 8:1 multiplexer

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3 bit binary adder is adder circuit which performs bit by bit addition and gives output as sum and carry .The truth table for a full adder :

We will require two 8:1 multiplexer to implement a full adder. One for sum and one for carry. In 8:1 MUX we have 3 selection lines, assigning them A, B, C.

For sum :

For carry ::