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In the  following  circuit,  the  output  for  all  possible inputs and is expressed by the truth table

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a
b
c
d

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detailed solution

Correct option is D

Gates-I and II are NOR and NOT gates, respectively.The output (A+B)of gate I will appear as input of gate II. The final output is Y= A+B = A+BThis is the boolean expression of OR gate whose truth table is given below:

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A digital  system  comprises  a  AND gate with a NOT gate on each of its inputs as shown in figure. To which  of the  following  single  gates  is this system equivalent?


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