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Answerthe answer is 24 WHICH is the result of the multiplication: 4x 3 x 2 x 1 = 24. You can try it practically as:

Numbering books as A,B, C, and D then the variations are:

  1. ABCD
  2. ABDC
  3. BACD
  4. BADC
  5. CDAB
  6. CDBA
  7. DCAB
  8. DCBA
  9. BCAD
  10. BCDA
  11. CBAD
  12. CBDA
  13. ADBC
  14. ADCB
  15. DABC
  16. DACB
  17. BDAC
  18. BDCA
  19. DBAC
  20. DBCA
  21. ACBD
  22. ACDB
  23. CABD
  24. CADB
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