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Q. The combination of NAND gates shown here under figure, are equivalent toPhysics Question Image

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

For first case, the Boolean expression is, $Y=\overline{\bar{A} \cdot \bar{B}}=A+ B$ hence for OR gate and for second case, the Boolean expression is $Y=\overline{\bar{A} \cdot \bar{B}}=A \cdot B$, and hence for AND gate.