69. For the multinomial distribution (Exercise 17), let Nt denote the number of times outcome / occurs.

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69. For the multinomial distribution (Exercise 17), let Nt denote the number of times outcome / occurs. Find

(0 E[NS]

(ii) Var(N,)

(iii) Cov(Ni9Nj)

(iv) Compute the expected number of outcomes which do not occur.

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