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Question 20

Identify the logic operation performed by the given circuit.

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$$\text{Top input} = \bar{A}$$

$$\text{Bottom input} = \bar{B}$$

Output $$Y$$ from the NAND gate configuration: $$Y = \overline{\bar{A} \cdot \bar{B}}$$

Applying De Morgan's Law ($$\overline{X \cdot Y} = \bar{X} + \bar{Y}$$):

$$Y = \overline{\bar{A}} + \overline{\bar{B}}$$

$$\implies Y = A + B \quad (\text{OR gate operation})$$

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