Jamie, without being rude and I hope I am wrong, but your request has more
than a strong hint of this being a question you have been set as part of
your studies.
Answering questions of this nature is surely not what allstat should be for!
I'm afraid I suggest you discuss any problems you are having, with regard to
developing the required formula, with your teacher and/or peers.
Best Wishes
Alun
-----------------------------------
Alun Owen
Senior Lecturer
Programme Leader MSc Industrial Data Modelling
Room GH 5.33
De Montfort University
The Gateway
Leicester LE1 9BH
Tel +44 (0)116 2078485
www.dmu.ac.uk
----- Original Message -----
From: "jamie burnett" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, September 19, 2006 12:06 PM
Subject: Probability Query
> Hi,
>
> I have a problem I am finding difficult to find a solution to and would I
> be grateful for your help.
>
>
> Problem:
>
> There are 4 possible outcomes, Q1, Q2, Q3 and Q4. Each outcome has an
> equal chance of being selected and the same outcome can be selected an
> infinite number of times. I would like to now what the probability is of
> selecting Q3 and Q4 for any given number of selections.
>
> For example If I have two selections then the probability of getting Q3
> and Q4 = 2/16. Because there are 16 possible scenarios and only two of
> them have Q3 and Q4 in them. When Q3 and Q4 are drawn is not important, Q3
> does not have to be drawn before Q4 and visa versa.
>
> I have worked out for three selections that the probability of Q3 and Q4
> being selected = 18/64.
>
> But I need a formula for n selections?
>
> Thanks
>
> Jamie
>
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