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Math Help - Probability Question

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    Junior Member Mrdavid445's Avatar
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    Probability Question

    A group of 5 people are going to meet weekly at the library for 4 weeks. Each week, two people are selected at random to speak. Each person may speak in multiple weeks, but no pair of people will speak together more than once. What is the probability that there is a person who will never be asked to speak?
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    Re: Probability Question

    Quote Originally Posted by Mrdavid445 View Post
    A group of 5 people are going to meet weekly at the library for 4 weeks. Each week, two people are selected at random to speak. Each person may speak in multiple weeks, but no pair of people will speak together more than once. What is the probability that there is a person who will never be asked to speak?

    Have you done any work on this question?

    How many possible pairs are there?
    How many ways can we select four of those pairs?
    How many of the pairs do not contain person A ?
    How many ways is person A not chosen?
    What is the probability that person A not chosen?
    Last edited by Plato; April 4th 2013 at 01:55 PM.
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  3. #3
    Junior Member Mrdavid445's Avatar
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    Re: Probability Question

    [Original post deleted]
    Last edited by Mrdavid445; April 4th 2013 at 05:21 PM.
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