Contestants A B C and D are in a 10K race How many different ways can a race with 4 runners be completed Assume there is no tie

Question

Contestants A B C and D are in a 10K race How many different ways can a race with 4 runners be completed Assume there is no tie In how many ways can B finish first and A finish second What is the probability that B finishes first and A finishes second Enter a reduced fraction or decimal

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