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#1 2006-03-29 10:07:00

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,535

Combinatorics Formulas

Combinatorics Formulas


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

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#2 2006-04-06 04:06:07

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,395

Re: Combinatorics Formulas

Permutations

The number of Permutations (arrangements) of n different things taken r at a time

where n! = n(n-1)(n-2)(n-3)......4 x 3 x 2 x 1

Some Important results

Combinations

The number of combinations (selections) of n different things taken r at a time

Some Important results


Character is who you are when no one is looking.

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#3 2006-10-01 05:27:21

All_Is_Number
Member
Registered: 2006-07-10
Posts: 258

Re: Combinatorics Formulas

Last edited by All_Is_Number (2006-10-01 12:48:10)


You can shear a sheep many times but skin him only once.

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