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Probability - Combinations

  1. Jan 20, 2010 #1
    1. The problem statement, all variables and given/known data

    I was wondering for what situations one uses the formula:
    (nCr x nCr)/ nCr ?
    2. Relevant equations

  2. jcsd
  3. Jan 20, 2010 #2


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    You mean (nCr x nCr)/ nCr = nCr? ;)

    There's a reason you use different letters to represent different quantities. It's hard to answer your question when you have removed all that information from the formula.
  4. Jan 20, 2010 #3
    well i mean for example,

    5C2 x 4C3 / nCr
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