First slide

Logic gates

Question

Consider the combination of two NOR gates shown in figure.The output Y for A=B=C=1 is,

Moderate

A

Y=0
B

Y=1
C

Y=3
D

None of these

Solution

$Y = \overset{______}{\overset{}{A + B} + C} = \bar{\bar{A + B} + \bar{\bar{C}}} = \bar{\bar{(A + B) . \bar{c}}} = (A + B) . \bar{c} = 0$

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