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Mathematics 17 Online
OpenStudy (anonymous):

A multivariate random variable (X1,X2,X3) takes values in the following set S with equal probability: S = {(1,1,1),(3,0,0),(0,3,0),(0,0,3),(1,2,3)}. Compute the marginal p.m.f. of Xi for each i = 1, 2, 3.

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