1.

You are given two circuit as shown in Fig. and . Show that circuit acts as OR gate while the circuit acts as AND gate

Answer» In Fig . , the output of NOR gate is made input for NOT gate. Then Boolean expression is
`y=bar(bar(A+B))=A+B`
Hence OR gate is formed.
In Fig. , the output of two NOT gate is made input for NOR gate. The Boolean expression is
`y=bar(barA+barB)=bar(barA).bar(barB)=A.B`
Hence AND gate is formed.


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