Use Exercise 33 to prove Theorem 4. [Hint: Count the
Chapter 9, Problem 35E(choose chapter or problem)
Problem 35E
Use Exercise 33 to prove Theorem 4. [Hint: Count the number of path s with n steps of the type described in Exercise 33. Every such path must end at one of the points (n − k , k) for k = 0, 1, 2, …, n .]
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