Show that there are C(n + r – q1 – q2 – ? ? qr? 1, n ? q1
Chapter 9, Problem 28E(choose chapter or problem)
Problem 28E
Show that there are C(n + r – q1 – q2 – ⋯ − qr− 1, n − q1 – q2 – ⋯ − qr) different unordered selections of n objects of r different types that include at least q1 objects of type one, q2 objects of type two, …, and qr objects of type r.
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