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Math Help - Basic Probability Question

  1. #1
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    Basic Probability Question

    If there are 7 red disks numbered 1 through 7 and 8 yellow disk numbered 8 through 15, find the probability of selecting a disk numbered 3 given that a red disk is selected.


    In my little mind I'm thinking this is too easy. There's only one number 3 so it has to be 1 of 15 but that seems too obvious. What am I overlooking? Thanks in advance for any help!
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  2. #2
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    Re: Basic Probability Question

    Quote Originally Posted by merccgs12 View Post
    If there are 7 red disks numbered 1 through 7 and 8 yellow disk numbered 8 through 15, find the probability of selecting a disk numbered 3 given that a red disk is selected.
    There's only one number 3 so it has to be 1 of 15 but that seems too obvious. What am I overlooking?
    You are overlooking the bit in red.
    So the answer is even easier than that it is one in seven.
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