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order

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

  • 2 years ago
  • 2 years ago

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  1. Walleye
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    do you know how to use "n choose r"

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

    • 2 years ago
  3. order
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    Yes, permutations

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

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

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

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

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

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

    • 2 years ago
  10. 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

    • 2 years ago
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