There are 21 students in a class

There are 21 students in a class. In how many different ways can a committee of 3 students be formed?

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 #13277