A warning buzzer is to sound when the following conditions occurs a)A or B are up b)A,C and D are up c) B,C and D are up d)B or D are up
Answer
According to logic gate theory
UP=ON=1
And
DOWN=OFF=0
therefore
One of input
A or B or C or D
Must be ON or Up
For
A warning buzzer is to sound.
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