Trivia

Subject:
Correct!

Alex Y
One way to see the answer (no matter how big the plane) is to give the first person a distinctive blue hat. Whenever someone sees their seat is taken the person in their seat hands them the blue hat to wear, and they pick another seat at random.

The answer for the last passenger is determined when the wearer of the blue hat either sits in the first passenger's assigned seat or in the last passenger's seat, and those possibilities are equally likely each time a person in a blue hat chooses a seat.

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