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NECO 2023 · Paper 1 · Q30

In how many ways can 10 people be seated at a round table if there is no restriction?

Worked solution (try it first)
  1. At a round table, turning everyone one seat round gives the same seating, so fix one person's seat.
  2. The other 9 people can then sit in 9!9! orders, and 9!=362 8809! = 362\,880, option A.

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