A number is selected at random from the first 40 natural numbers

A number is selected at random from the first 40 natural numbers. What is the probability that the number is a multiple of either 2 or 21?

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 #85771