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There are mainly three parts of Logic gates
(1) The 'OR' gate
(i) It has two inputs (A and B) and only one output (Y)
(ii) Boolean expression is Y = A + B
(iii) Given below the Truth table and logic symbol
(2) The 'AND' gate
(i) It has also two inputs and one output.
(ii) Boolean expression is Y = A • B
(iii) Given below Truth table and logic symbol:
(3) The 'NOT' gate
(i) It has only one input and only one output
(ii) Boolean expression is Y=A
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