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Math Help - Probability Mass Function?

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    Probability Mass Function?

    I need help with this probability question please...i have no idea what I am doing here....thanks in advance...

    A die is rolled 4 times. Let X and Y be the number of appearances of 1 and 6 respectively. Find the joint PMF of (X, Y).
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    Quote Originally Posted by rangergiya View Post
    I need help with this probability question please...i have no idea what I am doing here....thanks in advance...

    A die is rolled 4 times. Let X and Y be the number of appearances of 1 and 6 respectively. Find the joint PMF of (X, Y).
    If you know the multinomial distribution use that with possible outcomes 1, 6, other; with probabilitirs 1/6, 1/6, 2/3 respectivly.

    Otherwise list all the possible outcomes (1, 6, other) compute their probabilities and sum those with the same number 1's and 6's.

    CB
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