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Math Help - Permutations and combinations.

  1. #1
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    Permutations and combinations.

    ten students have been nominated for the positions of secretary, treasurer, social convenor, and fundraising chair. in how many ways can these positions be filled if the Norman twins are running and plan to switch positions on occasion for fun since no one can tell them apart.

    been having some trouble, any help is appreciated
    Last edited by mr fantastic; February 9th 2011 at 11:42 PM. Reason: Re-titled.
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  2. #2
    MHF Contributor harish21's Avatar
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    find the following:

    i)None of the twins is selected.

    ii)One out of the two twins is selected.

    iii)Both the twins are selected.

    Show your work if you are having problems.
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