There are 4 people and 4 chairs

There are 4 people and 4 chairs. In how many different ways people can occupy the chairs?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #1437