Combinatorics

From: David Mertz <voting-project_at_gnosis_dot_cx>
Date: Fri Apr 30 2004 - 11:55:53 CDT

On Apr 29, 2004, at 2:10 PM, Matteo Giacomazzi wrote:
> DL> Sorry I'm not sure I understand =). What do you mean by partial
> DL> permutations?
>
> Should be Combinatorial Calculus: you should compute the number of
> combinations of M elements in class N for each N in [1..M].
> The resulting formula is the one given by David a few posts ago! :)

This may be a translation thing, but in (mathematical) English we
distinguish between Combinations and Permutations.

A Combination is "How many ways can you select N items from a bag of M
items (without regard to the resulting order of the N choices)?"

A Permutation is "In how many orders can you select N items from a bag
of M items?" This is larger than the number of Combinations.

For ranked preference, we're talking about (sums of) permutations, as
my formula and table indicated.

Yours, David...

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Received on Fri Apr 30 23:17:26 2004

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