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Homework Help: Permutation question

  1. Sep 22, 2014 #1
    1. The problem statement, all variables and given/known data
    On his university application, Prashad must list his course choices in order of preference.

    He must choose four of the six courses available in his major discipline and three of the four courses offered in related subjects.

    In how many ways can Prashad list his course choices? Explain the reasoning for your answer

    2. The attempt at a solution

    Is it simply P(6,4) x P(4,3)? the concern i have is that would we need to mix the major discipline courses and the related subject courses together? But in that case would we even be able to solve it?

    Thank you for your help!
  2. jcsd
  3. Sep 22, 2014 #2


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    Looks that way to me.

    I really don't get what you mean here.
  4. Sep 22, 2014 #3

    Ray Vickson

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    Think about whether you should use P(6,4) or C(6,4), etc.
  5. Sep 23, 2014 #4


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    No, these are preferences. It doesn't make sense to have a preference order between a major course and related discipline.
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