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Questions  

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

Which combination has this table?

a
b
c
d

detailed solution

Correct option is B

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


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