First slide

Logic gates

Question

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

Moderate

A
B
C
D

Solution

Gates-I and II are NOR and NOT gates, respectively.
The output $(A + B)$ of gate I will appear as input of gate II. The final output is $Y = A + B = A + B$
This is the boolean expression of OR gate whose truth table is given below:

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