Hotel Cardinality (formerly California) (H). It is the stranded traveler’s fantasy. The Hotel Cardinality is a full-service luxury hotel with bar and restaurant. It has as many rooms as there are natural numbers. The room numbers are 1, 2, 3, 4, 5,. . . . You can see why stranded travelers love the Hotel Cardinality. There appears to be no need for the sad sign: No Vacancy. Suppose, however, that every room is occupied. Now it appears that the night manager must flash the No Vacancy sign. What if a weary traveler were to arrive late at night looking for a place to stay? Could the night manager figure out a way to provide the traveler with a private room (no sharing) without evicting another guest? The answer is yes. Describe how this accommodation can be made; of course, some guests will have to move to other rooms.
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