Question

A horse race has 13 entries. Assuming that there are no ties, what is the probability that the three horses owned by one person finish first, second, third

Answer 1

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

Assuming that the person does not have more than 3 horses in the race:

1/13 * 1/12 * 1/11 = ?

Answer 2

PsyDAG, your answer is wrong. The correct answer is
3/13 * 2/12 * 1/11 = 1/286