Mathematics, 11.06.2021 22:40, MysteryDove12

I have $5$ different mathematics textbooks and $4$ different psychology textbooks. In how many ways can I place the $9$ textbooks on a bookshelf, in a row, if there must be a psychology textbook exactly in the middle, and there must be a mathematics textbook at each end?

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I have $5$ different mathematics textbooks and $4$ different psychology textbooks. In how many ways...