# Random Sequencing

David Wilson davidwwilson at attbi.com
Tue Sep 17 18:51:20 CEST 2002

```Maybe this is better:

If you input 3 random integers from 0 to 10, you have 100% chance of finding
at least one sequence.

If you input 3 random integers from 0 to 100, you have 12.528% chance of
finding
at least one sequence.

----- Original Message -----
From: "Rainer Rosenthal" <r.rosenthal at web.de>
To: "David Wilson" <davidwwilson at attbi.com>; "Sequence Fanatics"
<seqfan at ext.jussieu.fr>
Sent: Tuesday, September 17, 2002 3:33 AM
Subject: Re: Re: Random Sequencing

> "David Wilson" <davidwwilson at attbi.com> schrieb am 17.09.02 00:18:13:
> > If you input three random numbers from 0 to 100, you will find an
average of
> > 1.073 sequences.
> >
> > If you input three random numbers from 0 to 10, you will find an average
of
> > 383.512 sequences.
>
> Hmm... funny information.
> I think it's more interesting to know the probability of *some* hit for
> a given set of three random numbers.
> The kind of "average" given above seems quite meaningless to me,
> since sequences are multiply counted obviously. What sense will it make
> to count all the sequences starting 0, 1, 2 ... ? Here *one* random
> sample with numbers 0,1,2 will get an overwhelming number of hits,
> which drives the average up without real meaning.
>
> With friendly regards
> Rainer Rosenthal
> r.rosenthal at web.de
>
>
>
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```