10/21 divided by (-15/7)
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Using the arrangements formula, it is found that there are 40,320 ways for these swimmers to finish.
<h3>What is the arrangements formula?</h3>The number of possible arrangements of n elements is given by the factorial of n, that is:
In this problem, there are n = 8 swimmers, hence they can finish arranged in 8! ways, that is:
More can be learned about the arrangements formula at brainly.com/question/24648661