The odds of your original door being right are 1%—that never changes. It’s determined by the options when the game was set up and when you picked it. If your

The odds of your original door being right are 1%—that never changes. It’s determined by the options when the game was set up and when you picked it. If your original door was wrong—99% chance—then it’s in one of the 99 other doors. But the host opens 98 of them, so if it was one of the 99 other doors—again, 99% chance—then the only option left is the last door.