If a number between 10 and 30 (inclusive) at random

If a number between 10 and 30 (inclusive) at random. What is the probability that the tens digit is greater than ones digit?

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 #81589