anonymous
  • anonymous
Ten athletes are running a 100 meter race. In how many different ways can the first three places be filled?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
do you know how to use "n choose r"
anonymous
  • anonymous
no you need to use permutations
anonymous
  • anonymous
Yes, permutations

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anonymous
  • anonymous
so use them :D
cathyangs
  • cathyangs
that would be nPr. this would be 10P3
anonymous
  • anonymous
I'm not sure how to in this question.
slaaibak
  • slaaibak
10 * 9 * 8 y0
anonymous
  • anonymous
total number 10, first three places is 3 and then go to your calculator
anonymous
  • anonymous
Ah Ok... Thank you!
slaaibak
  • slaaibak
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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