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

[Raymond Hettinger]

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

-1 on perms_with_repetitions.  That's headed in the direction of bloat
-- taking every formula in a textbook and putting it in the module. 
Also, it is somewhat use case challenged.  I've *never* needed this in
my 30 years of programming.

I like Mark's idea for names that indicate that they return a number or
count instead an iterator.  Perhaps something like:

  ncombinations()
  npermutations()
  ncombinations_with_replacement()

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5139>
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