> Seems like a type of a frame-of-reference question to me, thus both 
> answers (1:1, 2:3) are correct.

statistics and probability don't care about frames, but they do care
about base rates.

>  From the perspective of the original three closed doors: 2:3 

yes

>  From the perspective of the remaining two closed doors: 1:1

no

> But I'm probably wrong.

yes

Wouter van Ooijen

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