The output of a 2-inputs NOR gate is fed as input to a NOT gate. Write down the truth table for the final output of the combination.
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The output of two input of NOR gate is used as the input of NOT gate as shown in Fig. We get back as OR gate. Here the Boolean expression for output y is `y^(')=bar(A+B) and y=bar(bar(A+B))=A+B` The truth table of this combination will be as shown in Which is the truth table of OR gate.
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