Question: Let A = {1, 2, 3,..., 10}, and B = {1,2,3, ..., 7}. How many functions f: A B satisfy |f(A)| = 4? How

Let A = {1, 2, 3,..., 10}, and B = {1,2,3, ..., 7}. How many functions f: A → B satisfy |f(A)| = 4? How many have |f(A)| ≤ 4?

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