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A combination of logic gates has the truth table shown below:Which combination has this table?

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a

b

c

d

answer is B.

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Detailed Solution

(1)Z = P .Q = P + Q (2) Z= (P+Q)+Q=(P+Q)+Q=P+Q+Q=P+Q (3) Z= (P.Q)=(P.Q)+Q=P.Q+Q=Q (4) Z =P.Q From given truth table, Z=PQ+PQ+PQ=Q(P+P)+PQ=QP+PQ=PQSo, the truth table and combination of gates in option (2)performs OR operation.

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A combination of logic gates has the truth table shown below:Which combination has this table?