Computer Science for IGCSE & O level - Boolean Logic (Section 6 - No. 47)
The output of an OR gate is TRUE (1) when:
All inputs are FALSE (0).
All inputs are TRUE (1).
Any one or more inputs are TRUE (1).
All inputs are different.
Paliwanag
In an OR gate, if at least one input is TRUE (1), then the output is TRUE (1).