b.
22.
Logic symbols for the OR operation are shown below.
An OR-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. The OR operation produces a true (1) output when any input is true (1) or when all
inputs are true. If all inputs are false (0), the output is false (0). The logic diagram and
the truth table for a three-input OR operation am shown below.
Construct a truth table for the two-input OR operation below.
1-13
IT0342
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