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I have $3$ different mathematics textbooks, $2$ different psychology textbooks, and $2$ different chemistry textbooks. In how many ways can I place the $7$ textbooks on a bookshelf, in a row?

 May 30, 2024
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(3 + 2 + 2 ) !  = 7 !  = 5040 ways

 

cool cool cool

 May 30, 2024

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