[issue5139] Add combinatoric counting functions to the math module.

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Probably, these should be saved for an integer functions module.  In the
meantime, leaving this open with low priority.  There's not much of a
current need since the functions are so simple to write in pure python.
 The itertools docs provide the formulas for people who have forgotten them.

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