Question: 28. Using induction, binomial expansion, and the identity ; n n1 < (n n1)! n2! n3! nk! = n! n1! n2!

28. Using induction, binomial expansion, and the identity ; n n1 < (n − n1)! n2! n3! · · · nk! = n! n1! n2! · · · nk! , prove the formula of multinomial expansion.

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