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Math Help - how many onto functions are there...

  1. #1
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    Joined
    Sep 2008
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    103

    how many onto functions are there...

    how many onto functions are there from a set with seven elements to one with five elements???

    Here is my solution. I want to know if it is correct ot not.
    Thank you in advance
    Attached Thumbnails Attached Thumbnails how many onto functions are there...-solution-2-.jpg  
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