EXERCISE 5.2.6. Prove the Multinomial Theorem: that (11+1₂+ + Im)" = Σ k₁+k₂+ +km=n (Hint: Choose arbitrary values for k₁, k2,...,km such that k₁ +k₂ + and evaluate the coefficient of r2... equation.] m n (1₁. 12.,km) II. K2.... 1≤r≤m .... +km = n, that comes from the product on the left-hand side of the

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