Digital Electronics
An AND gate will function as OR if

All the inputs are ‘0’
All the inputs and outputs are complemente'
Either of the inputs is “1”
All the inputs to the gates are “1”

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Digital Electronics
Positive logic in a logic circuit is one in which

logic 0 and 1 are represented by 0 and positive voltage respectively
logic 0 voltage level is higher than logic 1 voltage level
logic 0 voltage level is lower than logic 1 voltage level.
logic 0 and, -1 are represented by negative and positive voltages respectively

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