Truth table for 3-inputs OR gate?

Answer 1

It is not easy to illustrate this in a table since it would need to be a 3-d table. The browser which we are required to use is bad enough for ordinary tables. So here goes:

X = True, Y = True, Z = True then (X or Y or Z) = True

X = True, Y = True, Z = False then (X or Y or Z) = True

X = True, Y = False, Z = True then (X or Y or Z) = True

X = True, Y = False, Z = False then (X or Y or Z) = True

X = True, Y = True, Z = True then (X or Y or Z) = True

X = True, Y = True, Z = False then (X or Y or Z) = True

X = True, Y = False, Z = True then (X or Y or Z) = True

X = True, Y = False, Z = False then (X or Y or Z) = False

The simple way to remember is that the OR gate gives False only when each input is False.