This material was developed with funding from the
National Science Foundation under Grant # DUE 1601612
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X = A × (B + C)
In this combination circuit the “A” input must be HIGH or true and “B” or “C” input must be HIGH or true to get a HIGH output on X. See the truth table below.
X = (A + BC ) + AB
The use of NOT gates can be used to change the state of the inputs and outputs of each gate in a combinational logic circuit