Final answer:
The Pauli exclusion principle states that no two electrons can have the same set of quantum numbers. However, different fermions can have the same quantum state.
Step-by-step explanation:
The Pauli exclusion principle states that no two electrons can have the same set of quantum numbers, meaning they cannot be in the same quantum state. This applies to any identical particles with half-integral intrinsic spin (s = 1/2, 3/2, ...), such as electrons. However, different fermions can have the same quantum state as long as they are not identical particles.