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A balanced die is tossed (independently) 21 times and let Xj be the number of times the number j appears,j = 1, .. ., 6.
i) What is the joint p.d.f. of the X's?
ii) Compute the probability that X1 = 6, X2 = 5, X3 = 4, X4 = 3, X5 = 2, X6 = 1.
Statistics and Probability, Statistics
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