1.

The logic circuit and its truth table are given, what is the gate X in the diagram

Answer»

SOLUTION :From the truth table we not that `Y=A+B`
i.e., it is for OR gate (or)
`A+X=A+B=A+B.(A+BARA)(because A+barA=1)`
then, `A+X=A+B.A+B.barA=A.(1+B)+barA.B=A+barA.B`
So `X=barA.B`, which is AND gate with INPUTS as `barA` and B


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