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Math Help - tree diagram

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    tree diagram

    a library has five copies of a certain textbook on reserve of which two copies (1 and 2) are first printings and the other three (3,4,5) are second printings. a student examines these books in random order, stopping only when a second printing has been selected. how do you make a tree diagram for this problem?
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  2. #2
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    Re: tree diagram

    Quote Originally Posted by amandacreed View Post
    a library has five copies of a certain textbook on reserve of which two copies (1 and 2) are first printings and the other three (3,4,5) are second printings. a student examines these books in random order, stopping only when a second printing has been selected. how do you make a tree diagram for this problem?

    I will give the only three possible outcomes. Assuming that the student does not examine the same book twice

    \mathcal{P}(S)=\frac{3}{5}

    \mathcal{P}(FS)=\frac{3}{10}

    \mathcal{P}(FFS)=\frac{1}{10}
    Last edited by Plato; November 29th 2012 at 07:53 AM.
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