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Of 9 students who took a statistics course, 4 earned an A, 3 earned a B,...

Of 9 students who took a statistics course, 4 earned an A, 3 earned a B, and 2 earned a C. 3 of the 9 students are selected at random. Let Y1 denote the number of students who earned an A and Y2 denote the number of students who earned a B among the 3 selected students. Find the joint probability mass function of Y1 and Y2.

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