Question: Let X1, X2, . . . , Xr (r 4) have the joint multinomial probability mass function p(x1, x2, . . . , xr)

Let X1, X2, . . . , Xr (r ≥ 4) have the joint multinomial probability mass function p(x1, x2, . . . , xr) with parameters n and p1, p2,

. . . , pr. Find the marginal probability mass functions pX1 and pX1,X2,X3 .

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