Question: A bag contains one red, two blue, three green, and four yellow balls. A sample of three balls is taken without replacement. Let B be

A bag contains one red, two blue, three green, and four yellow balls. A sample of three balls is taken without replacement. Let B be the number of blue balls and Y the number of yellow balls in the sample.
(a) Find the joint probability table.
(b) Find Cov(B, Y).

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