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How to solve this permutation question

  1. Dec 27, 2012 #1
    1. The problem statement, all variables and given/known data
    http://i49.tinypic.com/2hoeghs.png

    2. Relevant equations

    3. The attempt at a solution
    (i) 144 ways
    (ii) 2!*4!*3!
    (iii) 12*5!
    these are my answers
     
  2. jcsd
  3. Dec 27, 2012 #2

    tiny-tim

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    looks ok

    what is worrying you about that? :confused:
     
  4. Dec 27, 2012 #3
    are my answers correct?
     
  5. Dec 27, 2012 #4
    They look correct to me.
     
  6. Dec 27, 2012 #5
    Ok Thanks
     
  7. Dec 30, 2012 #6

    HallsofIvy

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    Generally, for 'The Attempt At A Solution' you should show what you actually did, not just list the answers.
     
  8. Jan 2, 2013 #7
    @HallsofIvy
    sorry for that next time I will post my full attempt.
     
  9. Jan 3, 2013 #8
    Shouldn't the answer to (i) be 1440

    5P3 * 4! = 1440

    The rest look fine to me.
     
  10. Jan 3, 2013 #9

    haruspex

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    No, it's 4!3!. How do you get 1440?
     
  11. Jan 3, 2013 #10
    I think you right, I made a mistake understanding the question .
    Thanks
     
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