A certain club has 20 members, including Harry

A certain club has 20 members, including Harry. One of the 20 members is to be chosen at random to be the president, one of the remaining 19 members is to be chosen at random to be the secretary, and one of the remaining 18 members is to be chosen at random to be the treasurer. What is the probability that Harry will be either the member chosen to be the secretary or the member chosen to be the treasurer?

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #50105