Combinations:

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   The number of combinations of r articles in n samples.
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   Form:
   c = Combinations( r, n )
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   ------
   Inputs
   ------
   r               (1,1)    Number of articles
   n               (1,1)    Number of samples

   -------
   Outputs
   -------
   c               (1,1)    Combinations

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Children:

Math: Linear/Factorl