Re: Me and David C. Ullrich
- From: "Elmo" <elmoritz@xxxxxxxxx>
- Date: 11 Oct 2005 13:19:03 -0700
Keith A. Lewis wrote:
> "Elmo" <elmoritz@xxxxxxxxx> writes in article <1129049892.725532.104830@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> dated 11 Oct 2005 09:58:12 -0700:
> >So, let's not make stupid statements. We have the statement, "Two coins
> >were flipped and at least one is a head."
> >
> >Two coins ordinarilly flip four equally likely ways. There are methods
> >for flipping two coins three equally likely ways? Was this one of them?
> >
> >How would you flip two coins three equally likely ways?
>
> One standard method is to flip two (different looking) coins, until you get
> a result which is not TT. Then the probabilities of HH, TH, and HT are all
> equal (assuming the coins are fair).
>
> --Keith Lewis klewis {at} mitre.org
> The above may not (yet) represent the opinions of my employer.
Go to the head of the class.
Select a null, prior to the flip, that's the key.
Two coins were flipped, until at least one was a head.
Two coins were flipped, until they were not HH.
Two coins were flipped, until they were not HT.
Two coins were flipped, until they were not TH.
For the last two to work the two coins must be in some way
distinguishable.
The 'until' tells us that the null was selected prior.
Eldon:)
.
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