Prove Corollary 5.9.2. In Corollary 5.9.2. Suppose that the random vector X = (X1, . . .

Question:

Prove Corollary 5.9.2.
In Corollary 5.9.2.
Suppose that the random vector X = (X1, . . . , Xk) has the multinomial with parameters n and p = (p1, . . . , pk) with k > 2. Let  < k, and let i1, . . . , i be distinct elements of the set {1, . . . , k}. The of Y = Xi1 + . . . + Xi is the binomial with parameters n and pi1 + . . . + pi. Distribution
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