Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Odds & Chances
Replies: 2   Last Post: Aug 2, 2006 12:07 PM

 Messages: [ Previous | Next ]
 richard boone Posts: 1 Registered: 8/2/06
RE: Odds & Chances
Posted: Aug 1, 2006 2:09 PM

Just to clarify.

The odds of laying off the oldest person 3 times in a row is
1/(39 x 38 x 37) or 1 in 54,834. The problem is a mathematical permutation
written as 39P3 or 39! /36! .In this type of problem the oddest must be laid
off before the second oldest, etc.

The odds are different for having the 3 oldest people laid off period where
the order of layoffs is immaterial as long as the end result is that the 3
oldest are laid off (like the Pick-Six lottery). This is a combinatorial
problem, mathematically written as 39C3 or 39! /(36! X 3!). Again the odds
are 1 in 9,139.

> -----Original Message-----
> From: numeracy-approval@world.std.com [mailto:numeracy-
> approval@world.std.com] On Behalf Of richard boone
> Sent: Monday, July 31, 2006 1:14 PM
> To: numeracy@europe.std.com
> Subject: RE: Odds & Chances
>
> The odds depend on exactly how you word the question.
>
> A permutation problem: 1 in 54,834 laying off 3 people, 1 at a time and
> happening to lay off the oldest each time.
>
> Combinatorial problem: 1 in 9,139 laying off the three oldest at the same
> time. This is the probability of choosing 3 people out of 39 at random.
>

> > -----Original Message-----
> > From: numeracy-approval@world.std.com [mailto:numeracy-
> > approval@world.std.com] On Behalf Of Earl Sellie
> > Sent: Thursday, July 27, 2006 5:19 PM
> > To: numeracy@world.std.com
> > Subject: Re: Odds & Chances
> >
> > I need to amend my previous question by adding in chronilogial order

> from
> > oldest to youngest.
>
> If a Company had 39 employees and they laid off the 3 oldest employees,
> does
> anybody know what the odds of that occuring by chance would be?

> >
> > -----------------------------------------------------------------------
> > -To unsubscribe from the Numeracy mail list send e-mail to
> > -majordomo@world.std.com.
> > -In the body of the message type "unsubscribe numeracy your_address"
> >
> > -If you have any questions e-mail edl@world.std.com

>
>
> -----------------------------------------------------------------------
> -To unsubscribe from the Numeracy mail list send e-mail to
> -majordomo@world.std.com.
> -In the body of the message type "unsubscribe numeracy your_address"
>
> -If you have any questions e-mail edl@world.std.com

-----------------------------------------------------------------------
-To unsubscribe from the Numeracy mail list send e-mail to
-majordomo@world.std.com.
-In the body of the message type "unsubscribe numeracy your_address"

-If you have any questions e-mail edl@world.std.com

Date Subject Author
8/1/06 richard boone
8/2/06 Virginia Tardaewether