Practical Mathematics for Grade 12, Problem ID: 4164

Practical Mathematics K12One by one, 40 cars enter a company parking lot with 40 assigned places.
The first driver forgets his place number and takes a random place.
The remaining drivers take their assigned place, if available, or take a random place.

What’s the probability that the last driver ends up in his original assigned place?

Inspired by Peter Winkler's airplane problem.


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