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7. At an international 100 m race, there are 4 Americans, 2 Jamaicans, 2 Canadians, 1...

7. At an international 100 m race, there are 4 Americans, 2 Jamaicans, 2 Canadians, 1 Russian, and 1 Chinese runner competing

. Assuming all possible outcomes for the race are equally likely, what is the probability the first three places are won by runners from 3 different countries?

Math   Statistics-And-Probability   
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