Eight books are placed on a shelf. three of them form a 3-volume series, two form a 2-volume series, and 3 stand on their own. in how many ways can the eight books be arranged so that the books in the 3-volume series are placed together according to their correct order, and so are the books in the 2-volume series?

480 ways

Explanation:

Given

There are 3-Volume series i.e.

No of ways in which they can be arranged in order is 2 i.e. or

For 2 volume series

There are two ways in which 2 volume series is arranged

Considering 3 volume books to be a single book denoted by a

and 2 volume books to be a single denoted by b

Thus we have to arrange a,b and 3 others books

No of ways in which 5 books can be arranged is 5!

also a and b can be arranged in two ways internally so

there are total of ==480 ways

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