There is a contest in a TV talk show. The guest can only win the lottery if he chooses the correct box which has gift inside from three boxes.
First, the host let the guest choose one box.
Second, after the guest made his choice, the host points out a box which does not have the gift inside from the remaing two boxes.
Third, the host askes if the guest wants to switch his choice.
Switch? or not switch?
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