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Here is another question from a probability book. This is not from a gmat resource, so I just have the OA. Here goes:
In front of Jeff's office there is a parking lot with 13 parking spots in a row. When cars arrive at this lot, they park randomly at one of the empty spots. Jeff parks his car in the only empty spot that is left. Then he goes to his office. On his return he finds that there are 7 empty spots. If he has not parked his car at either end of the parking area, what is the probability that both of the parking spaces that are next to Jeff's car are empty?
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All possible outcomes for 6 full places are 13C6=1986. Favorable outcomes, when Jeff is in the middle and the adjacent places are empty are 12.Then guess it is 12/1986 or 2/331.
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