A man buys 6 donuts, each of which is a plain donut, a powdered donut or a glazed donut
Chapter 9, Problem 20(choose chapter or problem)
A man buys 6 donuts, each of which is a plain donut, a powdered donut or a glazed donut. How many possible selections are there if he buys at least one donut of each kind? (a) Answer the question above by listing all possible selections in a table. (b) Answer the question above by determining the coefficient of x6 in a product of polynomials and/or power series. (c) Answer the question above by computing s+t1 s _ for an appropriate choice of s and t.
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