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NEET 2019 · Logic Gates

Logic Gates question from NEET 2019

Q149NEET 2019Medium

Logic Gates

The correct Boolean operation represented by the circuit diagram drawn is:

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Answer: (b)

Switches $A$ and $B$ are in series and together short the LED to ground.
The LED is shorted ( $Y=0$ ) only when both are closed.
In every other case it glows: $Y = \overline{AB}$ .
So the answer is (b) NAND.

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