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).

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