How Many Ways Can 9 Books Be Arranged On A Shelf?
How Many Ways Can 9 Books Be Arranged On A Shelf? So for each of the possible 40320 ways to arrange the other 8 books, there are 2 possible acceptable arrangements of 9 books. How many different ways can 9 things be arranged? arranged in 9P2 ways. ∴ hence the total number of arrangements =