Digital Electronics
The output of a logic gate is 0 when all its inputs are at logic 1. The gate is either

 a NAND or an X-OR
 a NOR or an X-NOR
 a NAND or an AND
 a NAND or an X-NOR

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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 0
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 1

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