6. (1) d.
7. What function is present when each of the following switches is
8. State the two reasons for using Boolean algebra with digital-
computer electronic switching circuits.
9. A switching network may contain a number of switches
represented by the same variable. When the function of a
variable is present, the function is present for every switch
represented by that same variable. For example:
The switching network above contains two switches represented
by variable A. When function A is present, both switches
represented by variable A will be closed.