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Math Help - Probability Question

  1. #1
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    Probability Question

    Based on the attached table, what is the probability that if two people are selected at random that they both of them are nonsmoking females

    What I did was

    (140/200)(90/200)(139/199)(89/199)

    but that was incorrect

    can someone tell me the accurate way to do this?

    thank you!
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  2. #2
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    \displaystyle\left( {\frac{{70}}{{200}}} \right)\left( {\frac{{69}}{{199}}} \right)

    Do you understand why?
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  3. #3
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    \frac{\left({70 \atop 2}\right)}{\left({200\atop 2}\right)}
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  4. #4
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    Quote Originally Posted by MathoMan View Post
    70c2/200c2
    @MathoMan
    Here is a comment: those two answers are equal.
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