Digital Electronics
The NAND gate can function as a NOT gate if

 one input is set to 1
 inputs are left open
 one input is set to 0
 all inputs are connected together

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

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

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