Math Is Fun Forum

MathsIsFun

Administrator

Registered: 2005-01-21

Posts: 7,713

Combinatorics Formulas

Combinatorics Formulas

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

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,395

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

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It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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)

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