/usr/share/calc/help/comb is in apcalc-common 2.12.4.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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comb - combinatorial number
SYNOPSIS
comb(x, y)
TYPES
x integer
y integer
return integer
DESCRIPTION
Return the combinatorial number C(x,y) which is defined as:
x!
---------
y!*(x-y)!
This function computes the number of combinations in which y things
may be chosen from x items ignoring the order in which they are chosen.
EXAMPLE
; print comb(7,3), comb(7,4), comb(7,5), comb(3,0), comb(0,0)
35 35 21 1 1
; print comb(2^31+1,2^31-1)
2305843010287435776
LIMITS
x >= y >= 0
y < 2^24
x-y < 2^24
LINK LIBRARY
void zcomb(ZVALUE x, ZVALUE y, ZVALUE *res)
SEE ALSO
fact, perm, randperm
## Copyright (C) 1999-2006 Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL. You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
##
## @(#) $Revision: 30.1 $
## @(#) $Id: comb,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/comb,v $
##
## Under source code control: 1994/10/20 04:03:02
## File existed as early as: 1994
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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