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In a class with 20 students, grades A, B, C, F are assigned. How many grade distributions (n_A, n_B, n_C, n_F) are possible if n_A

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In a class with 20 students, grades A, B, C, F are assigned. How many grade distributions (n_A, n_B, n_C, n_F) are possible if n_A + n_B + n_C + n_F = 20, there are as many As as Fs (n_A = n_F), and n_F

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