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Seven cars of seven different models are going to park in a row of seven side-by-side parking spots for an advertisement. Model P and Model Q must park next to each other, and Model S must be somewhere to the right of Models P & Q. How many possible configurations are there for the cars?
  • A600
  • B720
  • C1440
  • D4320
  • E4800
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正确答案: B

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