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A science teacher is arranging her books on a shelf. She has 4 astronomy books, 3 biology books, and 2 chemistry books. How many ways can she arrange these books on the shelf if the books from each subject must be together?

 May 22, 2021
 #1
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We can arrange the  Astronomy books in 4 !  =  24 ways

 

We can arrange  the Biology books in 3 !  = 6  ways

 

We can arrrange  the Chemistry books in  2  ways

 

And we  can arrange the  subjects in 3 !  ways = 6

 

So

 

24 * 6  * 2  * 6   =   1728 different ways

 

 

cool cool cool

 May 22, 2021

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