Seraph, you already know that the locket in the hosts hand is empty, so you must rule it out of the equation.
You only have a 50, 50 chance of picking the right one, not 66%
Your logic is faulty.
You have to rule out the opened locket, because picking it has a 100% chance of losing, it's not part of the game.
Of the remaining two you have an equal chance of picking the right one, so it is better to stick with what you've got, since you gain nothing by switching.
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-Jenn
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