Question: 44. Using induction, binomial expansion, and the identity prove the formula of multinomial expansion (Theorem 2.6). n nin! ng! (n-n)! nk! n! n! n! nk!

44. Using induction, binomial expansion, and the identity

n nin! ng! (n-n)! nk! n! n! n! nk!

prove the formula of multinomial expansion (Theorem 2.6).

n nin! ng! (n-n)! nk! n! n! n! nk!

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