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Math Help - Choosing from 12 people.

  1. #1
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    Choosing from 12 people.

    not done any probability in years, please can some1 help.

    there are 12 people, i am one of those people. one person is picked at a time (not replaced). What is the actually probability of me being picked? is it 1/6?

    i seem to get confused with the initial probability of me being picked as 1/12 and then the probability increases to 1/11 on the second pick.
    Last edited by mr fantastic; September 29th 2010 at 07:39 PM. Reason: Re-titled.
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  2. #2
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    \frac{1}{6} is the correct answer if only two people are selected.

    But you failed to give us that piece of information.
    How many are selected?
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  3. #3
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    thanks for your help!

    only two people are picked.

    so the fact that the probability changes from 1/12 to 1/11 after the first pick (if not selected) makes no difference to the actual probability??????. 1/6 (2/12) just doesn't seem logical to me...... baring in mind there is 2 sets of possibilities. oh well what do I know, your the experts !!
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  4. #4
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    Quote Originally Posted by zlatan View Post
    thanks for your help! only two people are picked.
    so the fact that the probability changes from 1/12 to 1/11 after the first pick (if not selected) makes no difference to the actual probability??????. 1/6 (2/12) just doesn't seem logical to me...... baring in mind there is 2 sets of possibilities. oh well what do I know, your the experts !!
    \displaystyle \frac{11}{\binom{12}{2}}=?
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