a. We could, for example, have an output tapped off gate 4 to use only the B + C function
somewhere else. And perhaps the individual outputs of inverter 1, 2, or 3 are needed for driving other
gates. A single AND gate would not provide these various output combinations.
b. Using Boolean algebra for labeling and simplifying will often enable you to clarify large
sections of circuits when you study logic diagrams just as we simplified this small one.