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6. There are 10 blue and 20 red balls in an urn. You pull out 4 balls without replacing them. Let X be the

6. There are 10 blue and 20 red balls in an urn. You pull out 4 balls without replacing them. Let X be the number of blue balls taken and Y be the number of red balls taken. a) Calculate the joint probability function w(x, y). b) Calculate the marginal probability functions of X and Y.

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