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

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

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

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