Let p(n, k) be the number of ways to write the integer n as a sum of exactly k positive integers. A theorem later in the text tells us that: p(n, k) = p(n – 1, k – 1) + p(n – k, k) Also, p(n, k) O when k >n and p(n, 0) = 0 and p(n, n) = 1. Write a recursive algorithm to find p(n, k).

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