In a 3 input AND gate, how many inputs must be high for a high output?

In a 3-input AND gate, for the output to be high (logic 1), all of the inputs must be high. This means that each input must receive a high signal (logic 1) in order for the gate to output a high signal. The fundamental operation of an AND gate is that it only produces a high output when every input is activated – in this case, all three inputs.

Therefore, with three inputs, the necessary condition for a high output is that all three must be high. If any one of the inputs is low (logic 0), the output will also be low regardless of the states of the other inputs. This characteristic makes the AND gate reliable for logical operations where all conditions must be satisfied simultaneously.