Question: 19. The multinomial theorem states that n (a+...+ar)= (m....).... n1,n2.. nr where denotes the sum over all nonnegative n++n=n integers n,2,...,nr, which sum to n.

19. The multinomial theorem states that

n (a+...+ar)"= (m....).... n1,n2.. nr where denotes the sum over all nonnegative

n (a+...+ar)"= (m....).... n1,n2.. nr where denotes the sum over all nonnegative n++n=n integers n,2,...,nr, which sum to n. Using the multi- nomial theorem, expand (a + 2a2+ a3).

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