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#174:Jaunty Paul
| In a Perplex City gameshow hosted by Jaunty Paul, you're
 presented with 3 doors. Behind
 one of the doors is a yacht, and
 the other two doors hide goats.
 Imagine you pick door A. Before
 you open it, Jaunty (who knows
 where everything is) steps in
 and opens up door C, which
 has one of the goats behind it.
 He then asks you, "Are you
 absolutely sure you want to
 stick with your choice, or do you
 want to switch to door B?"
 
 What is the probability that
 you'll get the yacht if you stay
 with door A, and what's the
 probability if you switch to door
 B?
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