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Undid revision 1225511641. While "vandalism" was a thoughtless edit summary, this material inappropriate in the lead. There are lots of right ways to analyze the problem, and lots of wrong ways that seem right -- that's why it's a paradox. We don't spell them all out in the lead. |
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{{Short description|Puzzle in logic and mathematics}}
[[File:Two envelopes.svg|thumb|The problem concerns two envelopes, each containing an unknown amount of money.]]
The '''two envelopes problem''', also known as the '''exchange paradox''', is a [[paradox]] in [[probability theory]]. It is of special interest in [[decision theory]] and for the [[Bayesian probability|Bayesian interpretation]] of [[probability|probability theory]]. It is a variant of an older problem known as the [[necktie paradox]].
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