I think one way people get it wrong is by arguing from symmetry; if I choose 1 and 3 is shown to be a goat, then that's the same as choosing 2 and being shown 3

I think one way people get it wrong is by arguing from symmetry; if I choose 1 and 3 is shown to be a goat, then that's the same as choosing 2 and being shown 3 is a goat. So what's the diff? Which is wrong but seductive.