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Math Help - Question regarding probability density function

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    Question regarding probability density function

    Suppose a fair die is tossed three times. Let X be the number of different faces that appear (so X = 1, 2, 3). Find px(k).
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    Quote Originally Posted by donald17 View Post
    Suppose a fair die is tossed three times. Let X be the number of different faces that appear (so X = 1, 2, 3). Find px(k).
    There are 6^3 possible outcomes.
    There are 120 ways to have three different faces.
    There are 90 ways to have two different faces.
    There are 6 ways to have only one face.
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