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anonymous

  • one year ago

Find the number of permutations of the first 12 letters taken 3 at a time.

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  1. sloppycanada
    • one year ago
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    12 letters of the alphabet I assume?

  2. anonymous
    • one year ago
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    I guess because that's all it says

  3. sloppycanada
    • one year ago
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    \[\frac{ n! }{ (n-r)! }\] Is the equation you want.

  4. dan815
    • one year ago
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    does permutations means u arent allowed to repeat letters

  5. dan815
    • one year ago
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    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

  6. dan815
    • one year ago
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    |dw:1435214436754:dw|

  7. dan815
    • one year ago
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    |dw:1435214481676:dw|

  8. sloppycanada
    • one year ago
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    Using this equation, I got 1320.

  9. anonymous
    • one year ago
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    I got 1320?

  10. dan815
    • one year ago
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    and then there will be another 10 for eeach of the paths on the 2nd pick, thats why we multiply 12*11*10

  11. dan815
    • one year ago
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    ya thats right

  12. anonymous
    • one year ago
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    Thank you <3

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