23.

Complete the truth table for the three-input AND operation below.

24.

complement of whatever is applied to its input. Two NOT (inverter)-logic symbols

are shown below.

The maximum number of inputs to a NOT circuit is one. The output is a 1 level

when the input is a 0 level; the output is a 0 level when the input is a 1 level. If the

input were labeled A, the output would be labeled Ā; if the input were labeled Ā, the

output would be labeled A. This logic symbol is called an inverter, because the

output is always the complement of the input. What is the maximum number of

inputs which may be applied to a NOT circuit?