Re: Envelopes!
I'll not post all my conclusions yet (partly because they are still incomplete) but i believe in case 2, that if we get to keep the money in the envelope we end up with (which is what i believe is the case) then we should always switch, except in some very obvious situations.
I also believe the opponent (who has motivation to win $100) needs a variable strategy.
As to case one, well, Im always going to switch if there's $1 in the envelope...
..now Im off to consider, and to give others a chance to do this one, I like this puzzle a lot
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