Re: basic combinatorics

From: Lynn Kurtz (kurtzDELETE-THIS_at_asu.edu)
Date: 01/29/05 

Date: Sat, 29 Jan 2005 01:58:05 GMT

On 28 Jan 2005 07:28:14 -0800, nissimnabar@gmail.com (Nissim Nabar)
wrote:

>Hi,
>I have a question for all of you.
>There are 50 ppl in a club.They are holding elections for the posts of
>President and Treasurer.
>These members include X and Y.
>X and Y will not work together .
>In how many ways can you select 2 ppl for the posts?
>
>My answer is: 1(D is chosen) * 48( neone other than E)*2( for
>permutation for the posts) =96
>similarly for E 96.
> if neither D nor E is chosen we have 48P2 ways of selection.
>Am I right?
>If not can someone give me the correct answer even if it is without
>the reasoning?
>Nissim

Off the top of my head I get 2448.

--Lynn

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