One more thing, in this 'riddle' it does not matter if you pick door x first and door y later, or door y and then y, or door z and then x, or ...
It's only the result that counts.
You face two doors, one is right, one is wrong. What is the chance of picking the right one?
That's not to say you are right about there being several ways to reach the same effect. The chances of doing it in a particualr way are less than 50, less than 33%. But that's not the issue
Before I forget, the other riddle's answer was an onion