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(`n` `k`) is the number of ways

- to choose a
`k`element set - from an
`n`-element set.

Example:

The set {0, 1, 2, 3} has 6 = (4 2) subsets with 2 elements:

{0, 1}, {0, 2}, {0, 3}, {1, 2}, {1, 3}, {2, 3}.

Author: Wolfgang Schreiner

Last Modification: November 16, 1999