Let n~ be defined for all positive integers n as the remainder…

Let n~ be defined for all positive integers n as the remainder when (n - 1)! is divided by n. What is the value of 31~ ?

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 #12622