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

[Raymond Hettinger]

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

I had a thought to name them perms(n,r), combs(n,r) and
combs_with_replacement(n,r).  The abbreviated names read nicely and
avoid a namespace collision with the itertools module (making the world
safe for "from math import *").

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<http://bugs.python.org/issue5139>
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