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Math Help - permutation

  1. #1
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    permutation

    There are 5 different pictures. We want to hange them on a wall. If we want a special one to be in the middle in how many ways we can hang them?
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    Re: permutation

    Quote Originally Posted by kastamonu View Post
    There are 5 different pictures. We want to hange them on a wall. If we want a special one to be in the middle in how many ways we can hang them?
    What are your ideas on this model?
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  3. #3
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    Re: permutation

    Kastamonu
    this an easy question . If one photo is your favourite then pick-it up and fix the remaining 4....you have as many choices as the permutations for 4 photos are. i.e 4!...easy....
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    Re: permutation

    Quote Originally Posted by MINOANMAN View Post
    Kastamonu
    this an easy question . If one photo is your favourite then pick-it up and fix the remaining 4....you have as many choices as the permutations for 4 photos are. i.e 4!...easy....
    @MINOANMAN, Why did you not let the student answer my request?
    You spoiled the chance that user Kastamonu might learn by doing.
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  5. #5
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    Re: permutation

    I did the samething but according to my book the answer is 48. 2 pictures from 4 can be chosen in 1/2p(4,2)=6 ways. they change places between themselves and this is 2! and this öakes 12. The other 2 pictures change places between themselves 2!. 12.2! is 24. If we think 4 pictures as 2 seperate groups : 24.2!=48.
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  6. #6
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    Re: permutation

    Quote Originally Posted by kastamonu View Post
    I did the samething but according to my book the answer is 48. 2 pictures from 4 can be chosen in 1/2p(4,2)=6 ways. they change places between themselves and this is 2! and this öakes 12. The other 2 pictures change places between themselves 2!. 12.2! is 24. If we think 4 pictures as 2 seperate groups : 24.2!=48.
    That textbook is wrong.
    If I were you, I would file a complaint with your educational authority about that poor text and or instructor.
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