Why does switching doors in the Monty Hall Problem increase odds: 2 doors, 50-50

Question

I have read through around 10 articles and webpages on this problem, and still don’t understand. I’ve run simulations and yes, switching does get you better odds, but why?

In: Mathematics

Answer 1

Opening one of the doors doesn’t make that door disappear. There are still three doors – one that you *know* doesn’t have the prize, & two that are unknown.