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Let's Make a Deal!
Suppose Lensman changed the rules of the Erasercash giveaway, and the winner is given the choice of three doors: Behind one door is a McLaren F1; behind the others, donkeys. You pick a door, say number 1, and Lensman, who knows what's behind the doors, opens another door, say number 3, which has a donkey. He then says to you, ``Do you want to pick door number 2?'' Is it to your advantage to switch your choice?
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