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question is below Problem 7. (15 pts) Let's count all the n X n matrices whose entries are 0, 1, or 2, such that each

question is below

Problem 7. (15 pts) Let's count all the n X n matrices whose entries are 0, 1, or 2, such that each row and each column have exactly one 1 and one 2, while the other entries are 0. Prove that the number of all such matrices is nan

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