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Math Help - Discrete probobility distributions

  1. #1
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    Discrete probobility distributions

    Okay, so my book is horrible and it doesnt explain things very well and i cant seem to find my answer anywhere online.

    I wont write out the example in the book since i think its irrelevant and way to long. I am struggling with the notation and how they get the answer.

    f(0) = P(X=0) = \frac{\left[\begin{array}{cc}3 \\0  \\\end{array}\right] \left[\begin{array}{cc}17 \\2  \\\end{array}\right]}{\left[\begin{array}{cc}20 \\2  \\\end{array}\right]} = \frac{68}{95}

    I m very confused on how they got the answer.
    I think the (3 0 ) = 0?

    Can someone please explain and
    work this out because i am completely lost and i am sure its easy.
    I am wiling to look at a webpage if i knew what to look up.

    Thank you
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  2. #2
    MHF Contributor
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    Re: Discrete probobility distributions

    Hey icelated.

    Hint: 3C0 is not 0: it's 1 since 3!/(0!*3!) = 1.
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