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TMUA Specimen Paper 2 Question 13

P2·Sets & Counting·6.5Specimen · P2 · Q13
permutationspartial-ordertournament-orderings
Five runners competed in a race: Fred, George, Hermione, Lavender, and Ron. Fred beat George. Hermione beat Lavender. Lavender beat George. Ron beat George. Assuming there were no ties, how many possible finishing orders could there have been, given only this information?
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