Digital Electronics
An AND gate will function as OR if

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

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

0 any input causes the output to be at logic 0
0 at any input causes the output to be at logic 1.
1 at any input causes the output to be at logic 0
1 at any input causes the output to be at logic 1

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