Question: Prove the multinomial theorem 1.9.1. (You may wish to use the same hint as in Exercise 20 in Sec. 1.8.) In theorem For all numbers

Prove the multinomial theorem 1.9.1. (You may wish to use the same hint as in Exercise 20 in Sec. 1.8.)
In theorem
For all numbers x1, . . . , xk and each positive integer n,

(x1 + +)"- n1. n2 n

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