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order

  • 4 years ago

Ten athletes are running a 100 meter race. In how many different ways can the first three places be filled?

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  1. Walleye
    • 4 years ago
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    do you know how to use "n choose r"

  2. Tomas.A
    • 4 years ago
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    no you need to use permutations

  3. order
    • 4 years ago
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    Yes, permutations

  4. Tomas.A
    • 4 years ago
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    so use them :D

  5. cathyangs
    • 4 years ago
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    that would be nPr. this would be 10P3

  6. order
    • 4 years ago
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    I'm not sure how to in this question.

  7. slaaibak
    • 4 years ago
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    10 * 9 * 8 y0

  8. Tomas.A
    • 4 years ago
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    total number 10, first three places is 3 and then go to your calculator

  9. order
    • 4 years ago
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    Ah Ok... Thank you!

  10. slaaibak
    • 4 years ago
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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

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