Not as easy as it looks!

Discrete Mathematics Level 5

There are 12 books in a shelf in a particular order. All books are unique. I decide to change their order such that no 2 books, adjacent earlier, are now adjacent.

For Example- Let the books be A,B,C,D.

A cannot come next to B, B cannot come next to A and C....and so on.

In how many ways can I arrange them?


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