20.
(Continued)
The AND-logic symbol may have two or more inputs; however, to accommodate more
than three inputs, the input side of the symbol is extended, as shown by the diagram on the
right. Remember, an AND circuit (AND gate) produces a true output if, and only if, all
conditions are true. The logic diagram and the truth table for a three-input AND operation
are shown below. Note that the output is true (1) only when all inputs are true (1).
Construct a truth table for the two-input AND operation below.
The NOT function is indicated by
21.
a. the absence of 0's and 1's.
b. a vinculum over the variable.
c. the mathematical addition symbol (+).
d. the mathematical multiplication symbol (x).
IT0342
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