Question: Let A = {1, 2, 3, 4, 5} and B = {6, 7, 8, 9, 10, 11, 12}. How many functions f:A^B are such that

Let A = {1, 2, 3, 4, 5} and B = {6, 7, 8, 9, 10, 11, 12}. How many functions f:A^B are such that f-1({6, 7, 8}) = {1,2}?

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