In math, we talked about SimpleMontyHall. Everyone knows how this game works right? Anyways, all of them start as 1/3. if one of the possibilities are crossed out, then one of the possibilities becomes 2/3. If you stay at that door your chances are still 1/3 because you didn’t move so that means the possibility that got ruled out made it when you switch your chances are 2/3. Which means if you stay at your door your chances will still remain 1/3 but then that means the other door has the chance of 2/3 from the door that got ruled out because if the door you’re staying at is 1/3 then the rest of the chances must be in the other door.