[figure] The output of the given circuit diagram is -
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Answer
(4) [figure]
Solution
Upper OR gate gets A and B; lower OR gate gets B and A; both feed the NOR gate.
Y= (A+ B)+( A+B)= (A+ A)+(B+ B)= 1=0
[figure]
at least one NOR input is always 1, Y = 0 for every input.
Answer: (4)