Question: 19. Let the joint probability mass function of X1,X2, . . . ,Xr be multinomial, that is, where x1 + x2 +

19. Let the joint probability mass function of X1,X2, . . . ,Xr be multinomial, that is,

n! P(x1, x2,...,x) =

where x1 + x2 + · · · + xr = n, and p1 + p2 + · · · + pr = 1. Show that for k

n! P(x1, x2,...,x) =

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