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Ten athletes are running a 100 meter race. In how many different ways can the first three places be filled?
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Walleye
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do you know how to use "n choose r"
Tomas.A
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no you need to use permutations
order
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Yes, permutations
Tomas.A
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so use them :D
cathyangs
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that would be nPr. this would be 10P3
order
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I'm not sure how to in this question.
slaaibak
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10 * 9 * 8 y0
Tomas.A
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total number 10, first three places is 3 and then go to your calculator
order
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Ah Ok... Thank you!
slaaibak
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First place can be held by any one of the 10.
Nine people remain.
Now second place can be held by any of the 9.
8 people remain.
Now third place can be held by any of the 8.
Therefore: 10 * 9 * 8