Combinatorial mathematics deals with, among other things, functions dealing with calculating or displaying the number of combinations one can have of 10 things taken two at a time, etc. then help me word it.
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See also

   * [Cartesian product of a list of lists] - little actual math here, but involves displaying one kind of combination
   * [Binomial coefficients] includes not only ''C(n,k)'' but also an implementation of the Gamma function.

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