anonymous
  • anonymous
Find the number of permutations of the first 12 letters taken 3 at a time.
Mathematics
schrodinger
  • schrodinger
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sloppycanada
  • sloppycanada
12 letters of the alphabet I assume?
anonymous
  • anonymous
I guess because that's all it says
sloppycanada
  • sloppycanada
\[\frac{ n! }{ (n-r)! }\] Is the equation you want.

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dan815
  • dan815
does permutations means u arent allowed to repeat letters
dan815
  • dan815
you have 12 letters, and you want to pick 3 of them you hae 12 choices for the first letter you pick, leaving you with any one of the 11 other choices leaving you with 10 other choices 12*11*10
dan815
  • dan815
|dw:1435214436754:dw|
dan815
  • dan815
|dw:1435214481676:dw|
sloppycanada
  • sloppycanada
Using this equation, I got 1320.
anonymous
  • anonymous
I got 1320?
dan815
  • dan815
and then there will be another 10 for eeach of the paths on the 2nd pick, thats why we multiply 12*11*10
dan815
  • dan815
ya thats right
anonymous
  • anonymous
Thank you <3

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