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Math Help - Help needed with combinatorics question.

  1. #1
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    Help needed with combinatorics question.

    i pictured if from paint because i don't know how to write symbols here.
    Any help will be appreciated.

    Thanks in advanced.
    Help needed with combinatorics question.-untitled.jpg
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  2. #2
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    Jul 2010
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    ok, so i have found that:
    Help needed with combinatorics question.-untitled2.jpg

    how do i now compute the all thing with r?
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