Q.

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

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a

b

c

d

answer is D.

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Detailed Solution

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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