Modify your circuit so that if conforms to the circuit shown in Fig. $12.$ Connected in this way Fig $12$

the multiplexer becomes a Boolean function generator. Step through each of the eight logic

states for $C,B$ and A $,$ and draw the truth table for the output Y as a function of $C,B$ and A $.$

Write down the Boolean expression for the result.

It should be clear that, by connecting each data input D$0$ through D$7$ to ground or $+5$ volts, any

arbitrary function of three input variables may be constructed using an $8-$line$-$to$-1$ multiplexer.