ISRO Administrative Officer 2008 Question 28

Question 28

Seven persons hand over the keys of their cars to a receptionist of a club. While leaving the club, they ask for the keys of their cars. All cars are of the same model of the same company. The receptionist hands over the keys to the members without knowing whose keys he is  handling over. How many times can two of them get the keys of their cars but remaining five can not?

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